std::localtime takes a global lock and is therefore not scalable and
inapplicable for analyzing timing sensible bugs.
Introduce a new option to add UTC timestamps. This allows on my system
to double the CPU load while using mmapped logging.

Also increase the LogBuffer size from 1MB to 1GB because I had some
crashes where a renewed buffer was still used.

This adds an option to make the scheduling parameters of the completer
thread configurable via a meson option.

Florian Fischer authored 4 years ago and Florian Schmaus committed 4 years ago

Modified-by: Florian Schmaus <flow@cs.fau.de>

Florian Fischer authored 4 years ago and Florian Schmaus committed 4 years ago

On our bigboxes the build failed because both liburing.h and
linux/time_types.h define struct __kernel_time_spec.
The linux headers were added because of iwyu and are not unnecessary.

Modified-by: Florian Schmaus <flow@cs.fau.de>

This also changes emper_log so that a std::ostringstream is used to
assemble the log message.

The default flavor is the preferred way to use the userspace library it uses
the sys_membarrier syscall or falls back to using userspace membarriers.

This adds the liburcu dependency which must be installed regardless the
'liburcu' meson option.