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set default nr_threads to floor(log(cores) * 2) + 1)

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This change prevents mscp from establishing too many ssh connections
on many-core machines in default.
This commit is contained in:
Ryo Nakamura
2022-12-11 14:01:52 +09:00
parent d27db01d8d
commit 3d98451bba
1 changed files with 15 additions and 5 deletions
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20
src/main.c
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@@ -90,10 +90,11 @@ void usage(bool print_help) {
if (!print_help)
return;
printf(" -n NR_CONNECTIONS number of connections (default: half of # of cpu cores)\n"
printf(" -n NR_CONNECTIONS number of connections "
"(default: floor(log(cores)*2)+1)\n"
" -m COREMASK hex value to specify cores where threads pinned\n"
" -s MIN_CHUNK_SIZE min chunk size (default: 64MB)\n"
" -S MAX_CHUNK_SIZE max chunk size (default: filesize / nr_conn)\n"
" -S MAX_CHUNK_SIZE max chunk size (default: filesize/nr_conn)\n"
"\n"
" -a NR_AHEAD number of inflight SFTP commands (default: 32)\n"
" -b BUF_SZ buffer size for i/o and transfer\n"
@@ -164,6 +165,7 @@ int expand_coremask(const char *coremask, int **cores, int *nr_cores)
char c[2] = { 'x', '\0' };
const char *_coremask;
long v, needle;
int ncores = nr_cpus();
/*
* This function returns array of usable cores in `cores` and
@@ -194,6 +196,8 @@ int expand_coremask(const char *coremask, int **cores, int *nr_cores)
for (needle = 0x01; needle < 0x10; needle <<= 1) {
nr_all++;
if (nr_all > ncores)
break; /* too long coremask */
if (v & needle) {
nr_usable++;
core_list = realloc(core_list, sizeof(int) * nr_usable);
@@ -216,6 +220,11 @@ int expand_coremask(const char *coremask, int **cores, int *nr_cores)
return 0;
}
int default_nr_threads()
{
return (int)(floor(log(nr_cpus()) * 2) + 1);
}
int main(int argc, char **argv)
{
struct ssh_opts opts;
@@ -237,8 +246,7 @@ int main(int argc, char **argv)
lock_init(&m.chunk_lock);
m.nr_ahead = DEFAULT_NR_AHEAD;
m.buf_sz = DEFAULT_BUF_SZ;
m.nr_threads = (int)(nr_cpus() / 2);
m.nr_threads = m.nr_threads == 0 ? 1 : m.nr_threads;
m.nr_threads = default_nr_threads();
while ((ch = getopt(argc, argv, "n:m:s:S:a:b:vqDl:p:i:c:M:CHdNh")) != -1) {
switch (ch) {
@@ -365,6 +373,7 @@ int main(int argc, char **argv)
pprint(2, " %d", cores[n]);
pprint(2, "\n");
}
pprint2("number of connections: %d\n", m.nr_threads);
/* create control session */
m.host = find_hostname(optind, argc, argv);
@@ -405,7 +414,8 @@ int main(int argc, char **argv)
/* prepare thread instances */
if ((n = list_count(&m.chunk_list)) < m.nr_threads) {
pprint3("we have only %d chunk(s). set NR_CONNECTIONS to %d\n", n, n);
pprint2("we have only %d chunk(s). "
"set number of connections to %d\n", n, n);
m.nr_threads = n;
}