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Questions tagged [google-benchmark]

84 questions
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Google benchmark negative perf counters

I'm using Google/benchmark for a project, and I just started playing around with the --benchmark_perf_counters flag. Clearly I'm doing something wrong, since the perf counters are often negative. I'm assuming it's an issue w/ overflow, but I still…
Throckmorton
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The time shown in Google-benchmark result does not make sense

I am bench-marking some example functions on my processsor, each core running at 2 GHz. Here are the functions being bench-marked. Also, available on quick-bench #include #include #include class Base { public: …
talekeDskobeDa
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What is the meaning of Google Benchmark Iteration?

I am working with Google Benchmark to measure the execution time of some code. For example, I wrote the following code to measure its execution time performance. #include // Alternatively, can add libraries using linker…
user12014522
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0 answers

fatal error: benchmark/benchmark.h: No such file or directory

Does anybody know what the following error message means? fatal error: benchmark/benchmark.h: No such file or directory #include benchmark/benchmark.h/ I should say that I have just installed Google Protobuf.
M R
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Google Benchmark: "***WARNING*** Library was built as DEBUG. Timings may be affected."

In ~/install/benchmark, I have checked out Google Benchmark (https://github.com/google/benchmark) and built it in Release mode according to the instructions here. In ~/personal-projects/benchmarking, I have my own code with a BUILD file and a…
bun9
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1 answer

How to change the increment or step or scale of a Google Benchmark 'Range()' function

I have a very simple Google Benchmark program that benchmarks a function taking two integer arguments, I'm trying to use the benchmark to see how exactly does the time the function takes increase as the second argument's value increases from 1 to…
YousefOnWeb
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Google test's `TestWithParam` alternative in Google benchmark?

In google test, people can use TestWithParam for customized parameter in a fixture. That is to say, write a class that inheritates testing::TestWithParam class, in which Customed_Params is my own defined class that holds customed…
ChrisZZ
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Would Google Benchmark library call testing blocks several times?

I have this minimal example of Google Benchmark usage. The weird thing is that "42" is printed a number of times (4), not just once. I understand that the library has to run things several times to gain statistics but this I though that this is…
alfC
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How to force google benchmark to run multiple iterations?

I use google benchmark to test two C++ functions. One runs for ~630,000,000 ns and one runs for ~1,000,000,000 ns. But both only run one iteration. How can I force the benchmark to run more iterations? I would like it to run at least 10 times.
Harper
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cannot create std::vector larger than max_size() for size below max_size

I am running google benchmark for some basic cache testing and I get the following error: terminate called after throwing an instance of 'std::length_error' what(): cannot create std::vector larger than max_size() However, I am printing the…
Mike
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Benchmark C `std::isdigit`

I am trying to benchmark the function std::isdigit from the header cctype (the one inherited from C, just to be clear). The code snippet is the following: void BM_IsDigit_C(::benchmark::State& state) { const char c = GenerateRandomChar(); for…
BiagioF
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Google Benchmark, how to call code only once?

I have a code snippet I need to benchmark composed of 2 parts, first the state needs to be set exactly once, next I need to actually benchmark a function. My code looks like this: static void BM_LoopTime(benchmark::State& state) { MasterEngine…
Makogan
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Google benchmark fixture: reuse vectors across multiple benchmarks

I want to run multiple benchmarks using google benchmark library after loading up a large file. I use the following code for this purpose. The function read_collection() loads the contents of the file and the benchmark Build processes the contents…
Unni
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Why does google benchmark csv_reporter print out unused headers?

We are using Google (micro) Benchmark (https://github.com/google/benchmark) to do benchmarking. When we display the results, the benchmark displays all headers (even unused ones). The benchmark results are displayed using csv_reporter…
Snowman
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Benchmark on quick-bench.com is much faster with disabled optimizations

I've created a very simple benchmark for illustration of short string optimization and run it on quick-bench.com. The benchmark works very well as for the comparison of SSO-disabled/enabled string class and the results are very consistent with both…
Daniel Langr
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