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test-process-util: run fewer getpid() tests
Significant time was spent in the getpid() measurement code, which is not very important. So let's optimize this a bit by running the slower version less times, and only running both tests a lesser amount of times unless slow tests are enabled. This gives the better accuracy then before in slow mode, and still reasonable accuracy in fast mode without a noticable slowdown.
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@ -595,27 +595,28 @@ static void test_getpid_cached(void) {
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assert_se(si.si_code == CLD_EXITED);
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}
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#define MEASURE_ITERATIONS (10000000LLU)
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static void test_getpid_measure(void) {
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unsigned long long i;
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usec_t t, q;
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log_info("/* %s */", __func__);
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unsigned long long iterations = slow_tests_enabled() ? 1000000 : 1000;
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log_info("/* %s (%llu iterations) */", __func__, iterations);
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t = now(CLOCK_MONOTONIC);
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for (i = 0; i < MEASURE_ITERATIONS; i++)
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for (unsigned long long i = 0; i < iterations; i++)
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(void) getpid();
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q = now(CLOCK_MONOTONIC) - t;
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log_info(" glibc getpid(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
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log_info(" glibc getpid(): %lf µs each\n", (double) q / iterations);
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iterations *= 50; /* _cached() is about 50 times faster, so we need more iterations */
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t = now(CLOCK_MONOTONIC);
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for (i = 0; i < MEASURE_ITERATIONS; i++)
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for (unsigned long long i = 0; i < iterations; i++)
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(void) getpid_cached();
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q = now(CLOCK_MONOTONIC) - t;
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log_info("getpid_cached(): %lf µs each\n", (double) q / MEASURE_ITERATIONS);
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log_info("getpid_cached(): %lf µs each\n", (double) q / iterations);
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}
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static void test_safe_fork(void) {
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