[dpdk-dev] [PATCH] eal/bsd: query the cpu count only once
Bruce Richardson
bruce.richardson at intel.com
Thu Mar 23 16:09:58 CET 2017
Rather than querying the number of CPUs on the system multiple times, and
printing out the number each time, just query the value from sysctl once
and store it for future reuse.
Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
---
lib/librte_eal/bsdapp/eal/eal_lcore.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/lib/librte_eal/bsdapp/eal/eal_lcore.c b/lib/librte_eal/bsdapp/eal/eal_lcore.c
index b8bfafde0..bc584dd53 100644
--- a/lib/librte_eal/bsdapp/eal/eal_lcore.c
+++ b/lib/librte_eal/bsdapp/eal/eal_lcore.c
@@ -53,12 +53,14 @@ eal_cpu_core_id(__rte_unused unsigned lcore_id)
static int
eal_get_ncpus(void)
{
+ static int ncpu = -1;
int mib[2] = {CTL_HW, HW_NCPU};
- int ncpu;
size_t len = sizeof(ncpu);
- sysctl(mib, 2, &ncpu, &len, NULL, 0);
- RTE_LOG(INFO, EAL, "Sysctl reports %d cpus\n", ncpu);
+ if (ncpu < 0) {
+ sysctl(mib, 2, &ncpu, &len, NULL, 0);
+ RTE_LOG(INFO, EAL, "Sysctl reports %d cpus\n", ncpu);
+ }
return ncpu;
}
--
2.11.0
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