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On some kernels, concurrent calls to the lscpu command result in severe slowdowns. For example, on v4.16, a single lscpu invocation takes about two milliseconds, four concurrent invocations more than two seconds, and 16 concurrent invocations more than 20 seconds. Given that the only goal is to learn the number of CPUs, invoking lscpu but once suffices. This commit therefore invokes lscpu early in kvm.sh execution, setting the initial value of the TORTURE_ALLOTED_CPUS environment variable. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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