Scarfski/tracy
1
0
Fork 0
mirror of https://github.com/wolfpld/tracy.git synced 2026-09-01 16:08:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

Raise the fd limit for the sample events.

Browse Source 
External sampling opens one event per CPU for each existing thread
(attach) or per CPU (launch) per event type, so a multithreaded target
needs many fds.
This commit is contained in:
Bartosz Taudul
2026-08-30 16:49:15 +02:00
parent 893439772f
commit fdff78584a
1 changed files with 20 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
monitor/src/monitor.cpp
View File

@@ -11,6 +11,7 @@
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/ptrace.h>
#include <sys/socket.h>
#include <sys/stat.h>
@@ -868,6 +869,25 @@ int main( int argc, char** argv )
return 1;
}
// external sampling opens one event per CPU for each existing thread
// (attach) or per CPU (launch) per event type; raise the soft fd limit
// so multithreaded targets fit (failing opens degrade gracefully).
{
struct rlimit rl = {};
if( getrlimit( RLIMIT_NOFILE, &rl ) == 0 && rl.rlim_cur < 65536 )
{
const rlim_t want = rl.rlim_max > 65536 ? 65536 : rl.rlim_max;
if( want > rl.rlim_cur )
{
rl.rlim_cur = want;
if( setrlimit( RLIMIT_NOFILE, &rl ) != 0 )
{
fprintf( stderr, "tracy-monitor: warning: could not raise RLIMIT_NOFILE (%s); very multithreaded targets may be only partially sampled.\n", strerror( errno ) );
}
}
}
}
pid_t attachPid = 0;
char attachName[128] = {};
bool wantAttach = false;