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background_thread: add max thread count config

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Looking at the thread counts in our services, jemalloc's background thread
is useful, but mostly idle.  Add a config option to tune down the number of threads.
This commit is contained in:
Dave Watson
2018-03-29 12:58:13 -07:00
parent 4be74d5112
commit 8b14f3abc0
7 changed files with 177 additions and 22 deletions
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50
test/unit/background_thread_enable.c
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@@ -1,6 +1,6 @@
#include "test/jemalloc_test.h"
const char *malloc_conf = "background_thread:false,narenas:1";
const char *malloc_conf = "background_thread:false,narenas:1,max_background_threads:20";
TEST_BEGIN(test_deferred) {
test_skip_if(!have_background_thread);
@@ -30,8 +30,54 @@ TEST_BEGIN(test_deferred) {
}
TEST_END
TEST_BEGIN(test_max_background_threads) {
test_skip_if(!have_background_thread);
size_t maxt;
size_t opt_maxt;
size_t sz_m = sizeof(maxt);
assert_d_eq(mallctl("opt.max_background_threads",
&opt_maxt, &sz_m, NULL, 0), 0,
"Failed to get opt.max_background_threads");
assert_d_eq(mallctl("max_background_threads", &maxt, &sz_m, NULL, 0), 0,
"Failed to get max background threads");
assert_zu_eq(20, maxt, "should be ncpus");
assert_zu_eq(opt_maxt, maxt,
"max_background_threads and "
"opt.max_background_threads should match");
assert_d_eq(mallctl("max_background_threads", NULL, NULL, &maxt, sz_m),
0, "Failed to set max background threads");
unsigned id;
size_t sz_u = sizeof(unsigned);
for (unsigned i = 0; i < 10 * ncpus; i++) {
assert_d_eq(mallctl("arenas.create", &id, &sz_u, NULL, 0), 0,
"Failed to create arena");
}
bool enable = true;
size_t sz_b = sizeof(bool);
assert_d_eq(mallctl("background_thread", NULL, NULL, &enable, sz_b), 0,
"Failed to enable background threads");
assert_zu_eq(n_background_threads, maxt,
"Number of background threads should be 3.\n");
maxt = 10;
assert_d_eq(mallctl("max_background_threads", NULL, NULL, &maxt, sz_m),
0, "Failed to set max background threads");
assert_zu_eq(n_background_threads, maxt,
"Number of background threads should be 10.\n");
maxt = 3;
assert_d_eq(mallctl("max_background_threads", NULL, NULL, &maxt, sz_m),
0, "Failed to set max background threads");
assert_zu_eq(n_background_threads, maxt,
"Number of background threads should be 3.\n");
}
TEST_END
int
main(void) {
return test_no_reentrancy(
test_deferred);
test_deferred,
test_max_background_threads);
}