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cgo
[ DIR ]
drwxr-xr-x
debug
[ DIR ]
drwxr-xr-x
internal
[ DIR ]
drwxr-xr-x
msan
[ DIR ]
drwxr-xr-x
pprof
[ DIR ]
drwxr-xr-x
race
[ DIR ]
drwxr-xr-x
testdata
[ DIR ]
drwxr-xr-x
trace
[ DIR ]
drwxr-xr-x
HACKING.md
13.07
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Makefile
178
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alg.go
10.18
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asm.s
1.16
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asm_386.s
40.2
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asm_amd64.s
45.78
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asm_arm.s
30.89
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asm_arm64.s
33.12
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asm_mips64x.s
22.45
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asm_mipsx.s
24.72
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asm_ppc64x.h
1023
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asm_ppc64x.s
29.39
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asm_riscv64.s
17.38
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asm_s390x.s
26.35
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asm_wasm.s
9.65
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atomic_arm64.s
259
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atomic_mips64x.s
296
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atomic_mipsx.s
258
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atomic_pointer.go
2.62
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atomic_ppc64x.s
433
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atomic_riscv64.s
307
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auxv_none.go
358
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callers_test.go
7.7
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cgo.go
2.01
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cgo_mmap.go
2.38
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cgo_ppc64x.go
411
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cgo_sigaction.go
3.09
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cgocall.go
21.38
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cgocallback.go
317
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cgocheck.go
6.8
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chan.go
19.71
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chan_test.go
21.27
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chanbarrier_test.go
1.4
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checkptr.go
2.5
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checkptr_test.go
1.27
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closure_test.go
936
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compiler.go
413
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complex.go
1.59
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complex_test.go
1.05
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cpuflags.go
740
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cpuflags_amd64.go
533
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cpuprof.go
6.65
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cputicks.go
478
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crash_cgo_test.go
13.71
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crash_nonunix_test.go
385
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crash_test.go
20.24
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crash_unix_test.go
8.89
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debug.go
1.63
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debug_test.go
6.16
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debugcall.go
2.83
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debuglog.go
17.08
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debuglog_off.go
356
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debuglog_on.go
1.09
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debuglog_test.go
4.56
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defer_test.go
9.98
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defs1_linux.go
844
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defs1_netbsd_386.go
2.84
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defs1_netbsd_amd64.go
3.07
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defs1_netbsd_arm.go
2.96
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defs1_netbsd_arm64.go
3.18
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defs1_solaris_amd64.go
4.02
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defs2_linux.go
3.51
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defs3_linux.go
1.09
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defs_aix.go
4.16
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defs_aix_ppc64.go
3.61
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defs_arm_linux.go
2.67
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defs_darwin.go
3.84
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defs_darwin_386.go
5.98
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defs_darwin_amd64.go
6.07
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defs_darwin_arm.go
3.78
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defs_darwin_arm64.go
3.84
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defs_dragonfly.go
2.54
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defs_dragonfly_amd64.go
3.25
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defs_freebsd.go
3.84
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defs_freebsd_386.go
4.35
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defs_freebsd_amd64.go
4.62
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defs_freebsd_arm.go
3.68
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defs_freebsd_arm64.go
4
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defs_illumos_amd64.go
285
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defs_linux.go
3.04
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defs_linux_386.go
4.05
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defs_linux_amd64.go
4.56
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defs_linux_arm.go
3.31
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defs_linux_arm64.go
3.23
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defs_linux_mips64x.go
3.04
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defs_linux_mipsx.go
3.18
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defs_linux_ppc64.go
3.28
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defs_linux_ppc64le.go
3.28
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defs_linux_riscv64.go
3.27
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defs_linux_s390x.go
2.76
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defs_netbsd.go
2.74
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defs_netbsd_386.go
854
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defs_netbsd_amd64.go
1.01
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defs_netbsd_arm.go
763
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defs_openbsd.go
2.6
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defs_openbsd_386.go
2.63
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defs_openbsd_amd64.go
2.83
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defs_openbsd_arm.go
2.74
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defs_openbsd_arm64.go
2.34
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defs_plan9_386.go
1.47
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defs_plan9_amd64.go
1.66
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defs_plan9_arm.go
1.73
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defs_solaris.go
3.33
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defs_solaris_amd64.go
1003
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defs_windows.go
2.07
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defs_windows_386.go
3.75
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defs_windows_amd64.go
4.51
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defs_windows_arm.go
3.59
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duff_386.s
8.24
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duff_amd64.s
5.53
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duff_arm.s
7.11
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duff_arm64.s
5.25
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duff_mips64x.s
11.28
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duff_ppc64x.s
2.45
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duff_s390x.s
507
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env_plan9.go
855
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env_posix.go
1.82
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env_test.go
1.28
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error.go
7.26
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example_test.go
1.34
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export_aix_test.go
204
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export_arm_test.go
226
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export_darwin_test.go
351
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export_debug_test.go
5.28
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export_debuglog_test.go
1.27
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export_futex_test.go
529
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export_linux_test.go
429
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export_mmap_test.go
481
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export_solaris_test.go
282
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export_test.go
23.58
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export_unix_test.go
2.28
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export_windows_test.go
652
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extern.go
11.6
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fastlog2.go
1.22
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fastlog2_test.go
784
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fastlog2table.go
904
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float.go
1.35
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funcdata.h
2.44
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futex_test.go
2.1
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gc_test.go
13.22
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gcinfo_test.go
6.18
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go_tls.h
366
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hash32.go
2.51
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hash64.go
2.6
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hash_test.go
17.54
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heapdump.go
17.1
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iface.go
15.78
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iface_test.go
6.81
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lfstack.go
1.77
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lfstack_32bit.go
522
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lfstack_64bit.go
2.15
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lfstack_test.go
2.78
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libfuzzer.go
2.58
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libfuzzer_amd64.s
940
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libfuzzer_arm64.s
751
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lock_futex.go
5.06
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lock_js.go
5.45
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lock_sema.go
6.6
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malloc.go
48.32
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malloc_test.go
9.37
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map.go
42.13
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map_benchmark_test.go
10.16
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map_fast32.go
12.18
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map_fast64.go
12.37
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map_faststr.go
13.82
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map_test.go
27.11
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mbarrier.go
12.14
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mbitmap.go
67.53
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mcache.go
5.61
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mcentral.go
7.14
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mem_aix.go
1.93
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mem_bsd.go
2.05
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mem_darwin.go
1.88
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mem_js.go
2.32
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mem_linux.go
5.58
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mem_plan9.go
4.53
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mem_windows.go
3.86
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memclr_386.s
2.4
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memclr_amd64.s
3.65
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memclr_arm.s
2.44
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memclr_arm64.s
3.48
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memclr_mips64x.s
785
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memclr_mipsx.s
1.24
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memclr_plan9_386.s
905
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memclr_plan9_amd64.s
433
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memclr_ppc64x.s
4.2
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memclr_riscv64.s
848
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memclr_s390x.s
1.89
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memclr_wasm.s
544
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memmove_386.s
4.45
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memmove_amd64.s
12.33
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memmove_arm.s
5.9
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memmove_arm64.s
3.56
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memmove_linux_amd64_test.go
1.61
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memmove_mips64x.s
1.82
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memmove_mipsx.s
4.39
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memmove_plan9_386.s
3.06
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memmove_plan9_amd64.s
3.04
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memmove_ppc64x.s
3.33
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memmove_riscv64.s
1.81
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memmove_s390x.s
2.92
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memmove_test.go
10.97
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memmove_wasm.s
1.74
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mfinal.go
14.8
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mfinal_test.go
5.85
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mfixalloc.go
2.72
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mgc.go
74.87
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mgcmark.go
46.5
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mgcscavenge.go
30.95
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mgcscavenge_test.go
12.34
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mgcstack.go
10.55
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mgcsweep.go
14.79
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mgcsweepbuf.go
5.98
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mgcwork.go
14.24
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mheap.go
61.5
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mkduff.go
6.23
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mkfastlog2table.go
1.32
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mkpreempt.go
13.33
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mksizeclasses.go
8.62
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mmap.go
847
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mpagealloc.go
35.25
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mpagealloc_32bit.go
3.75
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mpagealloc_64bit.go
6.51
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mpagealloc_test.go
28.88
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mpagecache.go
5.03
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mpagecache_test.go
9.93
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mpallocbits.go
10.69
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mpallocbits_test.go
12.93
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mprof.go
24.06
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mranges.go
5.41
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msan.go
1.39
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msan0.go
647
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msan_amd64.s
2.03
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msan_arm64.s
1.69
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msize.go
785
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mstats.go
22.62
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mwbbuf.go
10.07
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nbpipe_fcntl_libc_test.go
463
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nbpipe_fcntl_unix_test.go
445
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nbpipe_pipe.go
411
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nbpipe_pipe2.go
509
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nbpipe_test.go
2.17
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net_plan9.go
645
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netpoll.go
14.46
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netpoll_aix.go
4.64
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netpoll_epoll.go
4
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netpoll_fake.go
648
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netpoll_kqueue.go
4.39
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netpoll_solaris.go
10.56
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netpoll_stub.go
1.3
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netpoll_windows.go
4.51
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norace_linux_test.go
888
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norace_test.go
979
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numcpu_freebsd_test.go
381
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os2_aix.go
20.67
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os2_freebsd.go
302
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os2_openbsd.go
296
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os2_plan9.go
1.48
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os2_solaris.go
320
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os3_plan9.go
3.99
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os3_solaris.go
16.92
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os_aix.go
8.29
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os_android.go
463
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os_darwin.go
10.59
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os_darwin_arm.go
749
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os_darwin_arm64.go
416
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os_dragonfly.go
6.2
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os_freebsd.go
10.97
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os_freebsd2.go
478
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os_freebsd_amd64.go
529
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os_freebsd_arm.go
1.32
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os_freebsd_arm64.go
2.97
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os_freebsd_noauxv.go
254
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os_illumos.go
3.93
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os_js.go
2.93
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os_linux.go
13.16
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os_linux_arm.go
1.35
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os_linux_arm64.go
1.02
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os_linux_be64.go
816
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os_linux_generic.go
916
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os_linux_mips64x.go
999
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os_linux_mipsx.go
1.05
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os_linux_noauxv.go
307
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os_linux_novdso.go
298
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os_linux_ppc64x.go
527
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os_linux_riscv64.go
198
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os_linux_s390x.go
455
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os_linux_x86.go
2.69
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os_netbsd.go
8.49
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os_netbsd_386.go
588
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os_netbsd_amd64.go
585
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os_netbsd_arm.go
1.13
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os_netbsd_arm64.go
827
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os_nonopenbsd.go
436
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os_only_solaris.go
356
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os_openbsd.go
7.81
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os_openbsd_arm.go
749
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os_openbsd_arm64.go
714
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os_plan9.go
9.3
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os_plan9_arm.go
462
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os_solaris.go
6.49
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os_windows.go
37.01
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os_windows_arm.go
511
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panic.go
42.23
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panic32.go
4.79
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plugin.go
4.16
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Code Editor : mksizeclasses.go
// Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // +build ignore // Generate tables for small malloc size classes. // // See malloc.go for overview. // // The size classes are chosen so that rounding an allocation // request up to the next size class wastes at most 12.5% (1.125x). // // Each size class has its own page count that gets allocated // and chopped up when new objects of the size class are needed. // That page count is chosen so that chopping up the run of // pages into objects of the given size wastes at most 12.5% (1.125x) // of the memory. It is not necessary that the cutoff here be // the same as above. // // The two sources of waste multiply, so the worst possible case // for the above constraints would be that allocations of some // size might have a 26.6% (1.266x) overhead. // In practice, only one of the wastes comes into play for a // given size (sizes < 512 waste mainly on the round-up, // sizes > 512 waste mainly on the page chopping). // For really small sizes, alignment constraints force the // overhead higher. package main import ( "bytes" "flag" "fmt" "go/format" "io" "io/ioutil" "log" "os" ) // Generate msize.go var stdout = flag.Bool("stdout", false, "write to stdout instead of sizeclasses.go") func main() { flag.Parse() var b bytes.Buffer fmt.Fprintln(&b, "// Code generated by mksizeclasses.go; DO NOT EDIT.") fmt.Fprintln(&b, "//go:generate go run mksizeclasses.go") fmt.Fprintln(&b) fmt.Fprintln(&b, "package runtime") classes := makeClasses() printComment(&b, classes) printClasses(&b, classes) out, err := format.Source(b.Bytes()) if err != nil { log.Fatal(err) } if *stdout { _, err = os.Stdout.Write(out) } else { err = ioutil.WriteFile("sizeclasses.go", out, 0666) } if err != nil { log.Fatal(err) } } const ( // Constants that we use and will transfer to the runtime. maxSmallSize = 32 << 10 smallSizeDiv = 8 smallSizeMax = 1024 largeSizeDiv = 128 pageShift = 13 // Derived constants. pageSize = 1 << pageShift ) type class struct { size int // max size npages int // number of pages mul int shift uint shift2 uint mask int } func powerOfTwo(x int) bool { return x != 0 && x&(x-1) == 0 } func makeClasses() []class { var classes []class classes = append(classes, class{}) // class #0 is a dummy entry align := 8 for size := align; size <= maxSmallSize; size += align { if powerOfTwo(size) { // bump alignment once in a while if size >= 2048 { align = 256 } else if size >= 128 { align = size / 8 } else if size >= 16 { align = 16 // required for x86 SSE instructions, if we want to use them } } if !powerOfTwo(align) { panic("incorrect alignment") } // Make the allocnpages big enough that // the leftover is less than 1/8 of the total, // so wasted space is at most 12.5%. allocsize := pageSize for allocsize%size > allocsize/8 { allocsize += pageSize } npages := allocsize / pageSize // If the previous sizeclass chose the same // allocation size and fit the same number of // objects into the page, we might as well // use just this size instead of having two // different sizes. if len(classes) > 1 && npages == classes[len(classes)-1].npages && allocsize/size == allocsize/classes[len(classes)-1].size { classes[len(classes)-1].size = size continue } classes = append(classes, class{size: size, npages: npages}) } // Increase object sizes if we can fit the same number of larger objects // into the same number of pages. For example, we choose size 8448 above // with 6 objects in 7 pages. But we can well use object size 9472, // which is also 6 objects in 7 pages but +1024 bytes (+12.12%). // We need to preserve at least largeSizeDiv alignment otherwise // sizeToClass won't work. for i := range classes { if i == 0 { continue } c := &classes[i] psize := c.npages * pageSize new_size := (psize / (psize / c.size)) &^ (largeSizeDiv - 1) if new_size > c.size { c.size = new_size } } if len(classes) != 67 { panic("number of size classes has changed") } for i := range classes { computeDivMagic(&classes[i]) } return classes } // computeDivMagic computes some magic constants to implement // the division required to compute object number from span offset. // n / c.size is implemented as n >> c.shift * c.mul >> c.shift2 // for all 0 <= n <= c.npages * pageSize func computeDivMagic(c *class) { // divisor d := c.size if d == 0 { return } // maximum input value for which the formula needs to work. max := c.npages * pageSize if powerOfTwo(d) { // If the size is a power of two, heapBitsForObject can divide even faster by masking. // Compute this mask. if max >= 1<<16 { panic("max too big for power of two size") } c.mask = 1<<16 - d } // Compute pre-shift by factoring power of 2 out of d. for d%2 == 0 { c.shift++ d >>= 1 max >>= 1 } // Find the smallest k that works. // A small k allows us to fit the math required into 32 bits // so we can use 32-bit multiplies and shifts on 32-bit platforms. nextk: for k := uint(0); ; k++ { mul := (int(1)<<k + d - 1) / d // ā2^k / dā // Test to see if mul works. for n := 0; n <= max; n++ { if n*mul>>k != n/d { continue nextk } } if mul >= 1<<16 { panic("mul too big") } if uint64(mul)*uint64(max) >= 1<<32 { panic("mul*max too big") } c.mul = mul c.shift2 = k break } // double-check. for n := 0; n <= max; n++ { if n*c.mul>>c.shift2 != n/d { fmt.Printf("d=%d max=%d mul=%d shift2=%d n=%d\n", d, max, c.mul, c.shift2, n) panic("bad multiply magic") } // Also check the exact computations that will be done by the runtime, // for both 32 and 64 bit operations. if uint32(n)*uint32(c.mul)>>uint8(c.shift2) != uint32(n/d) { fmt.Printf("d=%d max=%d mul=%d shift2=%d n=%d\n", d, max, c.mul, c.shift2, n) panic("bad 32-bit multiply magic") } if uint64(n)*uint64(c.mul)>>uint8(c.shift2) != uint64(n/d) { fmt.Printf("d=%d max=%d mul=%d shift2=%d n=%d\n", d, max, c.mul, c.shift2, n) panic("bad 64-bit multiply magic") } } } func printComment(w io.Writer, classes []class) { fmt.Fprintf(w, "// %-5s %-9s %-10s %-7s %-10s %-9s\n", "class", "bytes/obj", "bytes/span", "objects", "tail waste", "max waste") prevSize := 0 for i, c := range classes { if i == 0 { continue } spanSize := c.npages * pageSize objects := spanSize / c.size tailWaste := spanSize - c.size*(spanSize/c.size) maxWaste := float64((c.size-prevSize-1)*objects+tailWaste) / float64(spanSize) prevSize = c.size fmt.Fprintf(w, "// %5d %9d %10d %7d %10d %8.2f%%\n", i, c.size, spanSize, objects, tailWaste, 100*maxWaste) } fmt.Fprintf(w, "\n") } func printClasses(w io.Writer, classes []class) { fmt.Fprintln(w, "const (") fmt.Fprintf(w, "_MaxSmallSize = %d\n", maxSmallSize) fmt.Fprintf(w, "smallSizeDiv = %d\n", smallSizeDiv) fmt.Fprintf(w, "smallSizeMax = %d\n", smallSizeMax) fmt.Fprintf(w, "largeSizeDiv = %d\n", largeSizeDiv) fmt.Fprintf(w, "_NumSizeClasses = %d\n", len(classes)) fmt.Fprintf(w, "_PageShift = %d\n", pageShift) fmt.Fprintln(w, ")") fmt.Fprint(w, "var class_to_size = [_NumSizeClasses]uint16 {") for _, c := range classes { fmt.Fprintf(w, "%d,", c.size) } fmt.Fprintln(w, "}") fmt.Fprint(w, "var class_to_allocnpages = [_NumSizeClasses]uint8 {") for _, c := range classes { fmt.Fprintf(w, "%d,", c.npages) } fmt.Fprintln(w, "}") fmt.Fprintln(w, "type divMagic struct {") fmt.Fprintln(w, " shift uint8") fmt.Fprintln(w, " shift2 uint8") fmt.Fprintln(w, " mul uint16") fmt.Fprintln(w, " baseMask uint16") fmt.Fprintln(w, "}") fmt.Fprint(w, "var class_to_divmagic = [_NumSizeClasses]divMagic {") for _, c := range classes { fmt.Fprintf(w, "{%d,%d,%d,%d},", c.shift, c.shift2, c.mul, c.mask) } fmt.Fprintln(w, "}") // map from size to size class, for small sizes. sc := make([]int, smallSizeMax/smallSizeDiv+1) for i := range sc { size := i * smallSizeDiv for j, c := range classes { if c.size >= size { sc[i] = j break } } } fmt.Fprint(w, "var size_to_class8 = [smallSizeMax/smallSizeDiv+1]uint8 {") for _, v := range sc { fmt.Fprintf(w, "%d,", v) } fmt.Fprintln(w, "}") // map from size to size class, for large sizes. sc = make([]int, (maxSmallSize-smallSizeMax)/largeSizeDiv+1) for i := range sc { size := smallSizeMax + i*largeSizeDiv for j, c := range classes { if c.size >= size { sc[i] = j break } } } fmt.Fprint(w, "var size_to_class128 = [(_MaxSmallSize-smallSizeMax)/largeSizeDiv+1]uint8 {") for _, v := range sc { fmt.Fprintf(w, "%d,", v) } fmt.Fprintln(w, "}") }
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