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From fe6e09aa0931112e7e3750801858c66129c7a3a8 Mon Sep 17 00:00:00 2001
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From: Frantisek Sumsal <frantisek@sumsal.cz>
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Date: Tue, 5 Mar 2019 16:08:00 +0100
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Subject: [PATCH] test: try to determine QEMU_SMP dynamically
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If the QEMU_SMP value has not been explicitly set, try to determine it
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from the number of online CPUs using the nproc utility. If this approach
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fails, fall back to the default value QEMU_SMP=1.
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This change should significantly help when running integration tests
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under QEMU on multicore systems.
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(cherry picked from commit 5bfb2a93a4a36bba0d24199553dcda6e560cbb75)
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Related: #1823767
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---
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test/test-functions | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/test/test-functions b/test/test-functions
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index 0938e6e826..3f1c327f3c 100644
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--- a/test/test-functions
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+++ b/test/test-functions
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@@ -120,7 +120,16 @@ run_qemu() {
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fi
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fi
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- [ "$QEMU_SMP" ] || QEMU_SMP=1
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+ # If QEMU_SMP was not explicitly set, try to determine the value 'dynamically'
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+ # i.e. use the number of online CPUs on the host machine. If the nproc utility
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+ # is not installed or there's some other error when calling it, fall back
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+ # to the original value (QEMU_SMP=1).
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+ if ! [ "$QEMU_SMP" ]; then
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+ if ! QEMU_SMP=$(nproc); then
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+ dwarn "nproc utility is not installed, falling back to QEMU_SMP=1"
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+ QEMU_SMP=1
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+ fi
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+ fi
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find_qemu_bin || return 1
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