61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
#include "test/jemalloc_test.h"
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/*
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* This is a helper utility, only meant to be run manually (and, for example,
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* doesn't check for failures, try to skip execution in non-prof modes, etc.).
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* It runs, allocates objects of two different sizes from the same stack trace,
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* and exits.
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*
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* The idea is that some human operator will run it like:
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* MALLOC_CONF="prof:true,prof_final:true" test/analyze/prof_bias
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* and manually inspect the results.
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*
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* The results should be:
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* jeprof --text test/analyze/prof_bias --inuse_space jeprof.<pid>.0.f.heap:
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* around 1024 MB
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* jeprof --text test/analyze/prof_bias --inuse_objects jeprof.<pid>.0.f.heap:
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* around 33554448 = 16 + 32 * 1024 * 1024
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*
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* And, if prof_accum is on:
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* jeprof --text test/analyze/prof_bias --alloc_space jeprof.<pid>.0.f.heap:
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* around 2048 MB
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* jeprof --text test/analyze/prof_bias --alloc_objects jeprof.<pid>.0.f.heap:
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* around 67108896 = 2 * (16 + 32 * 1024 * 1024)
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*/
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static void
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mock_backtrace(prof_bt_t *bt) {
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bt->len = 4;
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bt->vec[0] = (void *)0x111;
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bt->vec[1] = (void *)0x222;
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bt->vec[2] = (void *)0x333;
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bt->vec[3] = (void *)0x444;
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}
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static void
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do_allocs(size_t sz, size_t cnt, bool do_frees) {
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for (size_t i = 0; i < cnt; i++) {
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void *ptr = mallocx(sz, 0);
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assert_ptr_not_null(ptr, "Unexpected mallocx failure");
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if (do_frees) {
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dallocx(ptr, 0);
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}
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}
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}
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int
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main(void) {
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size_t lg_prof_sample = 19;
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int err = mallctl("prof.reset", NULL, NULL, (void *)&lg_prof_sample,
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sizeof(lg_prof_sample));
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assert(err == 0);
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prof_backtrace_hook = &mock_backtrace;
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do_allocs(16, 32 * 1024 * 1024, /* do_frees */ true);
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do_allocs(32 * 1024* 1024, 16, /* do_frees */ true);
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do_allocs(16, 32 * 1024 * 1024, /* do_frees */ false);
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do_allocs(32 * 1024* 1024, 16, /* do_frees */ false);
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return 0;
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}
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