[erlang-questions] test_server and timetraps
Mon Dec 7 15:18:17 CET 2009
Thanks for poiniting this out. I agree it has to be changed, or at least
properly documented. Will do.
Erlang/OTP, Ericsson AB
Jayson Vantuyl wrote:
> Just to save anybody else the trouble, test_server has some... interesting behavior.
> I had tests with timeouts of 5 seconds that would run for 15 and still not be killed. This seemed odd, so I checked it out.
> Apparently, when certain options are turned on, the test_server will scale up your timeouts. Buried deep within the bowels of test_server, there is a sprinkling of code that determines a "multiplier" for your timetraps. Apparently, it considers running under code coverage reason to scale your timeout by a factor of 10! This was definitely a surprise. Although, I admit that the fact that running on VXworks increases timeouts by another factor 5 was good for a laugh.
> I decided to mail the list so that this would be on the webs for people to find.
> It turns out that it is documented in test_server, but not in common_test. Can somebody document this in common_test, so that people don't wonder why their timetraps seemingly never kick in? The built in testing / debugging / tracing under Erlang is absolutely wonderful, but it's so woefully documented that I'm surprised that anybody uses it. Let's just say a 12 minute timeout becoming a two hour timeout is not "expected behavior". :(
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