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This is done by reusing the existing cross-platform
`getProcessElapsedTime()` function, which already provides nanosecond
monotonic clocks, and fallback for platforms that don't have those.
To do this, `getProcessElapsedTime()` had to be moved from a private RTS
symbol into the public interface.
Accuracy is improved in 2 ways:
* Use of the monotonic clock where available
* Measuring the total time spent waiting instead of a sum
of intervals (between which there are small gaps)
Reviewers: bgamari, austin, hvr, erikd, simonmar
Reviewed By: bgamari
Subscribers: rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3953
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This both says what we mean and silences a bunch of spurious CPP linting
warnings. This pragma is supported by all CPP implementations which we
support.
Reviewers: austin, erikd, simonmar, hvr
Reviewed By: simonmar
Subscribers: rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3482
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Use of this helper function was removed in:
commit 3c9fc104337a142fe4f375d30d7a6b81d55a70c1
Author: Brian Brooks <brooks.brian@gmail.com>
Date: Thu Jul 10 02:55:33 2014 -0500
Avoid unnecessary clock_gettime() syscalls in GC stats.
Noticed by uselex.rb:
getThreadCPUTime: [R]: exported from:
./rts/dist/build/posix/GetTime.p_o
Signed-off-by: Sergei Trofimovich <siarheit@google.com>
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This reverts commit 39b5c1cbd8950755de400933cecca7b8deb4ffcd.
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This will hopefully help ensure some basic consistency in the forward by
overriding buffer variables. In particular, it sets the wrap length, the
offset to 4, and turns off tabs.
Signed-off-by: Austin Seipp <austin@well-typed.com>
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Fixes T3807 on OS X 32.
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Terminology cleanup: the type "Ticks" has been renamed "Time", which
is an StgWord64 in units of TIME_RESOLUTION (currently nanoseconds).
The terminology "tick" is now used consistently to mean the interval
between timer signals.
The ticker now always ticks in realtime (actually CLOCK_MONOTONIC if
we have it). Before it used CPU time in the non-threaded RTS and
realtime in the threaded RTS, but I've discovered that the CPU timer
has terrible resolution (at least on Linux) and isn't much use for
profiling. So now we always use realtime. This should also fix
The default tick interval is now 10ms, except when profiling where we
drop it to 1ms. This gives more accurate profiles without affecting
runtime too much (<1%).
Lots of cleanups - the resolution of Time is now in one place
only (Rts.h) rather than having calculations that depend on the
resolution scattered all over the RTS. I hope I found them all.
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The other existing time utilities give us time elapsed since process
or thread start. This is for wall clock time, using the common Unix
epoch interpretation.
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This has no effect with static libraries, but when the RTS is in a
shared library it does two things:
- it prevents the function from being exposed by the shared library
- internal calls to the function can use the faster non-PLT calls,
because the function cannot be overriden at link time.
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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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