June 2023 - Boost-users - lists.stage.boost.cppalliance.org

[asio] monitoring io_context load
by Dmitry 07 Jul '23

07 Jul '23

Hello, I would like to have a metric that measures time spent for work (executing completion handlers) vs time spent waiting for work in thread pool executing io_context::run(). It will help to estimate service capacity (i.e. how many more requests per second it can handle). It is similar to the system's CPU usage metric but CPU usage metric does not include waiting for mutex locks or sync io performed from completion handlers. In our performance tests io_context becomes overloaded (the queue grows faster than it's processed) when CPU usage is about 85%. I would like to have a metric that shows 100% in this case. There is BOOST_ASIO_CUSTOM_HANDLER_TRACKING macro that allows to intercept handler invocations and to measure execution time. But in the case of many lightweight handlers measuring time can bring significant overhead. I'm considering adding similar macros before and after waiting for the condition variable and epoll to measure wait time and then calculate execution time. I'm writing to ask if there is a better alternative? If not, would you be interested in a patch that adds "Handler Tracking" macros around wait calls? Thank you, Dmitry

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[python][shared_ptr_from_python.hpp] looks like copy/paste or merge error
by Ran Regev 29 Jun '23

29 Jun '23

Hi, The code in construct() seems to surfer from copy/paste or merge error. It seems as though the following lines are duplicated in the else clause: void *const storage = ((converter::rvalue_from_python_storage<SP<T> >*)data)->storage.bytes; // Deal with the "None" case. if (data->convertible == source) new (storage) SP<T>(); Please take a look at: https://www.boost.org/doc/libs/1_82_0/boost/python/converter/shared_ptr_fro… Ran.

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[multiprecision] why 128 bit numbers isn't used in msvc?
by shar yashuv Giat 29 Jun '23

29 Jun '23

msvc added 128 bit numbers(in the header __msvc_int128.hpp). I know multiprecision uses __128 to improve performance so why doesn't it use msvc version? it's seems easy to change and will probably improve performance.

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