commit 574ecbb0fcbddd1937d104d199247052042d9a16
author Yann Collet <cyan@fb.com> Sun Jun 19 11:38:06 2022 -0700
committer Yann Collet <cyan@fb.com> Sun Jun 19 11:38:06 2022 -0700
tree 805119d4c594a4749469a14368e33f8e4e1a0bd9
parent b33ef91694f0b8b13471da0a39e584c4000f89fe

display a warning message when using C90 clock_t for MT speed measurements.

programs/benchzstd.c

diff --git a/programs/benchzstd.c b/programs/benchzstd.c
index fa2659e..6ceca02 100644
--- a/programs/benchzstd.c
+++ b/programs/benchzstd.c
@@ -13,7 +13,7 @@
 *  Tuning parameters
 ****************************************/
 #ifndef BMK_TIMETEST_DEFAULT_S   /* default minimum time per test */
-#define BMK_TIMETEST_DEFAULT_S 3
+# define BMK_TIMETEST_DEFAULT_S 3
 #endif
 
 
@@ -387,6 +387,13 @@
         RDG_genBuffer(compressedBuffer, maxCompressedSize, 0.10, 0.50, 1);
     }
 
+#if defined(UTIL_TIME_USES_C90_CLOCK)
+    if (adv->nbWorkers > 1) {
+        OUTPUTLEVEL(2, "Warning : time measurements restricted to C90 clock_t. \n")
+        OUTPUTLEVEL(2, "Warning : using C90 clock_t leads to incorrect measurements in multithreading mode. \n")
+    }
+#endif
+
     /* Bench */
     {   U64 const crcOrig = (adv->mode == BMK_decodeOnly) ? 0 : XXH64(srcBuffer, srcSize, 0);
 #       define NB_MARKS 4