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These are no longer used: once upon a time they used to have different
layout from IND and IND_PERM respectively, but that is no longer the
case since we changed the remembered set to be an array of addresses
instead of a linked list of closures.
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The first phase of this tidyup is focussed on the header files, and in
particular making sure we are exposinng publicly exactly what we need
to, and no more.
- Rts.h now includes everything that the RTS exposes publicly,
rather than a random subset of it.
- Most of the public header files have moved into subdirectories, and
many of them have been renamed. But clients should not need to
include any of the other headers directly, just #include the main
public headers: Rts.h, HsFFI.h, RtsAPI.h.
- All the headers needed for via-C compilation have moved into the
stg subdirectory, which is self-contained. Most of the headers for
the rest of the RTS APIs have moved into the rts subdirectory.
- I left MachDeps.h where it is, because it is so widely used in
Haskell code.
- I left a deprecated stub for RtsFlags.h in place. The flag
structures are now exposed by Rts.h.
- Various internal APIs are no longer exposed by public header files.
- Various bits of dead code and declarations have been removed
- More gcc warnings are turned on, and the RTS code is more
warning-clean.
- More source files #include "PosixSource.h", and hence only use
standard POSIX (1003.1c-1995) interfaces.
There is a lot more tidying up still to do, this is just the first
pass. I also intend to standardise the names for external RTS APIs
(e.g use the rts_ prefix consistently), and declare the internal APIs
as hidden for shared libraries.
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Allows hs_free_fun_ptr() to be called by a separate thread
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Change the way we look for work in the scheduler. Previously,
checking to see whether there was anything to do was a
non-side-effecting operation, but this has changed now that we do
work-stealing. This lead to a refactoring of the inner loop of the
scheduler.
Also, lots of cleanup in the new work-stealing code, but no functional
changes.
One new statistic is added to the +RTS -s output:
SPARKS: 1430 (2 converted, 1427 pruned)
lets you know something about the use of `par` in the program.
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- GCAux.c contains code not compiled with the gct register enabled,
it is callable from outside the GC
- marking functions are moved to their relevant subsystems, outside
the GC
- mark_root needs to save the gct register, as it is called from
outside the GC
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This patch implements pointer tagging as per our ICFP'07 paper "Faster
laziness using dynamic pointer tagging". It improves performance by
10-15% for most workloads, including GHC itself.
The original patches were by Alexey Rodriguez Yakushev
<mrchebas@gmail.com>, with additions and improvements by me. I've
re-recorded the development as a single patch.
The basic idea is this: we use the low 2 bits of a pointer to a heap
object (3 bits on a 64-bit architecture) to encode some information
about the object pointed to. For a constructor, we encode the "tag"
of the constructor (e.g. True vs. False), for a function closure its
arity. This enables some decisions to be made without dereferencing
the pointer, which speeds up some common operations. In particular it
enables us to avoid costly indirect jumps in many cases.
More information in the commentary:
http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/HaskellExecution/PointerTagging
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In preparation for parallel GC, split up the monolithic GC.c file into
smaller parts. Also in this patch (and difficult to separate,
unfortunatley):
- Don't include Stable.h in Rts.h, instead just include it where
necessary.
- consistently use STATIC_INLINE in source files, and INLINE_HEADER
in header files. STATIC_INLINE is now turned off when DEBUG is on,
to make debugging easier.
- The GC no longer takes the get_roots function as an argument.
We weren't making use of this generalisation.
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Patch mostly from Lennart Augustsson in #803, with additions to
Task.c by me.
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A simple interface for generating trace messages with timestamps and
thread IDs attached to them. Most debugging output goes through this
interface now, so it is straightforward to get timestamped debugging
traces with +RTS -vt. Also, we plan to use this to generate
parallelism profiles from the trace output.
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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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