MonetDB: Dec2025 - Attempt to figure out number of configured CP...

[Sjoerd Mullender via checkin-list]

Changeset: 12b2d710db0b for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/12b2d710db0b
Modified Files:
        gdk/gdk_system.c
Branch: Dec2025
Log Message:

Attempt to figure out number of configured CPUs inside docker container.


diffs (25 lines):

diff --git a/gdk/gdk_system.c b/gdk/gdk_system.c
--- a/gdk/gdk_system.c
+++ b/gdk/gdk_system.c
@@ -1249,6 +1249,21 @@ MT_check_nr_cores(void)
                        if (ncpu < ncpus)
                                return ncpu;
                }
+       } else {
+               f = fopen("/sys/fs/cgroup/cpu.max", "r");
+               if (f != NULL) {
+                       int32_t quota, period;
+                       /* there should either be two numbers, or the
+                        * word "max" followed by a number; the latter
+                        * case is ignored by the fscanf not returning
+                        * 2 */
+                       if (fscanf(f, SCNi32 " " SCNi32, &quota, &period) == 2 
&& period > 0) {
+                               int ncpu = quota / period;
+                               if (ncpu < ncpus)
+                                       ncpus = ncpu;
+                       }
+                       fclose(f);
+               }
        }
 #endif
 
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