From 5eb3e3a1f0933b00820830b0b1d18b8fb8a4ee88 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <benoitjacob@google.com>
Date: Thu, 24 Mar 2022 14:28:27 +0000
Subject: [PATCH] set s_numCpus before reading it

---
 client/TracySysTrace.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/client/TracySysTrace.cpp b/client/TracySysTrace.cpp
index d078e240..cb455090 100644
--- a/client/TracySysTrace.cpp
+++ b/client/TracySysTrace.cpp
@@ -817,6 +817,8 @@ bool SysTraceStart( int64_t& samplingPeriod )
     samplingPeriod = GetSamplingPeriod();
     uint32_t currentPid = (uint32_t)getpid();
 
+    s_numCpus = (int)std::thread::hardware_concurrency();
+
     const auto maxNumBuffers = s_numCpus * (
         1 +     // software sampling
         2 +     // CPU cycles + instructions retired
@@ -824,7 +826,6 @@ bool SysTraceStart( int64_t& samplingPeriod )
         2 +     // branch retired + miss
         2       // context switches + wakeups
     );
-    s_numCpus = (int)std::thread::hardware_concurrency();
     s_ring = (RingBuffer*)tracy_malloc( sizeof( RingBuffer ) * maxNumBuffers );
     s_numBuffers = 0;