rdtsc (empty) → 1.1.1
raw patch · 10 files changed
+511/−0 lines, 10 filesdep +basebuild-type:Customsetup-changed
Dependencies added: base
Files
- COPYING +340/−0
- README +36/−0
- Setup.hs +2/−0
- System/CPUTime/Rdtsc.hs +41/−0
- cbits/rdtsc.c +10/−0
- cbits/rdtsc.h +4/−0
- rdtsc.cabal +29/−0
- tests/Makefile +22/−0
- tests/TestRdtsc.hs +8/−0
- tests/test_rdtsc.c +19/−0
+ COPYING view
@@ -0,0 +1,340 @@+ GNU GENERAL PUBLIC LICENSE+ Version 2, June 1991++ Copyright (C) 1989, 1991 Free Software Foundation, Inc.+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++ Preamble++ The licenses for most software are designed to take away your+freedom to share and change it. By contrast, the GNU General Public+License is intended to guarantee your freedom to share and change free+software--to make sure the software is free for all its users. This+General Public License applies to most of the Free Software+Foundation's software and to any other program whose authors commit to+using it. (Some other Free Software Foundation software is covered by+the GNU Library General Public License instead.) You can apply it to+your programs, too.++ When we speak of free software, we are referring to freedom, not+price. 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+ README view
@@ -0,0 +1,36 @@+ -*-outline-*-+* README file for Rdtsc binding++This small Cabal package provides a Haskell binding to the "rdtsc"+machine instruction on modern IA-32 processors. This instruction can+be used to read the number of cycles since processor startup and gives+very accurate timing information.++** Usage++Use++ runghc Setup.hs configure+ runghc Setup.hs build+ runghc Setup.hs install++for building and installing system-wide, or++ runghc Setup.hs configure --prefix=$HOME/haskell-modules+ runghc Setup.hs build+ runghc Setup.hs install --user++for building and installing in directory $HOME/haskell-modules.++Just import module "System.CPUTime.Rdtsc" into your Haskell file and use++ ghc --make FILENAME++to compile your program.++The "tests" directory contains a small test program for the module and+demonstrates its usage. There is also a C version for this test+program, to test the overheads of Haskell's FFI.++Happy Haskell hacking,+ Martin
+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ System/CPUTime/Rdtsc.hs view
@@ -0,0 +1,41 @@+--------------------------------------------------------------------------+-- |+-- Module: System.CPUTime.Rdtsc+-- Copyright: (c) 2006-2007 Martin Grabmueller+-- License: GPL+-- +-- Maintainer: magr@cs.tu-berlin.de+-- Stability: provisional+-- Portability: non-portable (requires IA-32 processor and GHC)+--+-- This module provides the function "rdtsc" for accessing the rdtsc+-- machine register on modern IA-32 processors. This is a 64-bit+-- counter which counts the number of processor cycles since the+-- machine has been powered up.+--+-- As an example, you may use the following program to measure the overhead+-- of calling this function:+--+-- > module Main where+-- > import System.CPUTime.Rdtsc+-- >+-- > main = do+-- > t1 <- rdtsc+-- > t2 <- rdtsc+-- > putStrLn ("Cost of rdtsc (ffi call): " ++ show (t2 - t1))+--------------------------------------------------------------------------+module System.CPUTime.Rdtsc(rdtsc) where++import Foreign++-- | Return the number of clock cycles since the machine this function+-- is called on has been powered up. Note that the value returned+-- may be inaccurate if the program is run on some hardware+-- virtualization layer.+--+-- Especially on multi-core processors and when using hibernating+-- operating systems, the values returned may be bogus.+--+-- For more information about the @rdtsc@ instruction, see +-- <http://en.wikipedia.org/wiki/RDTSC>+foreign import ccall unsafe "rdtsc.h" rdtsc :: IO Word64
+ cbits/rdtsc.c view
@@ -0,0 +1,10 @@+/* #include "rdtsc.h" */++unsigned long long +rdtsc(void)+{+ unsigned long long val;+ __asm__ __volatile__ ("rdtsc" : "=A" (val));+ return val;+}+
+ cbits/rdtsc.h view
@@ -0,0 +1,4 @@+#define rdtscll(val) \+ __asm__ __volatile__ ("rdtsc" : "=A" (val))++unsigned long long rdtsc(void);
+ rdtsc.cabal view
@@ -0,0 +1,29 @@+Name: rdtsc+Version: 1.1.1+License: GPL+License-file: COPYING+Author: Martin Grabmueller <magr@cs.tu-berlin.de>+Maintainer: magr@cs.tu-berlin.de+Homepage: http://uebb.cs.tu-berlin.de/~magr/projects/rdtsc/doc/+Category: System+Synopsis: Binding for the rdtsc machine instruction+Description: This module provides the function 'rdtsc' for accessing+ the 'rdtsc' machine register on modern IA-32 processors. This is+ a 64-bit counter which counts the number of processor cycles since+ the machine has been powered up. Using this instruction, you can+ make very precise time measurements which are independent of the+ actual CPU frequency. But note that you can get strange results+ sometimes on a superscalar processor.+ .+ Also note that the Haskell foreign function interface imposes some+ additional overheads. On my machine, it takes about 950 cycles to+ call this function twice and to compute the difference, whereas in+ C the overhead is only about 88 cycles.+Stability: Experimental+Build-depends: base+Exposed-Modules: System.CPUTime.Rdtsc+Extensions: ForeignFunctionInterface+C-sources: cbits/rdtsc.c+Include-dirs: cbits+Install-includes: rdtsc.h+ghc-options: -O -Wall -Werror
+ tests/Makefile view
@@ -0,0 +1,22 @@+GHC=ghc+GHCFLAGS=-O -fglasgow-exts -i../..++CC=gcc+CFLAGS=-O2++all: rdtsc_haskell rdtsc_c++rdtsc_haskell: TestRdtsc.hs+ $(GHC) $(GHCFLAGS) --make -o $@ $<++rdtsc_c: test_rdtsc.c rdtsc.o+ $(CC) $(CFLAGS) -o $@ -I../cbits test_rdtsc.c rdtsc.o++rdtsc.o: ../cbits/rdtsc.c ../cbits/rdtsc.h+ $(CC) $(CFLAGS) -c -I../cbits $<++clean:+ rm -f *.o *.hi++really-clean: clean+ rm -f rdtsc_haskell rdtsc_c
+ tests/TestRdtsc.hs view
@@ -0,0 +1,8 @@+module Main where++import System.CPUTime.Rdtsc++main = do+ t1 <- rdtsc+ t2 <- rdtsc+ putStrLn ("Cost of rdtsc (ffi call): " ++ show (t2 - t1))
+ tests/test_rdtsc.c view
@@ -0,0 +1,19 @@+#include <stdio.h>++#include "rdtsc.h"++int+main (int argc, char * argv[])+{+ unsigned long long t1, t2;+ int x;++ t1 = rdtsc();+ t2 = rdtsc();+ printf("Cost of rdtsc (function call): %lld\n", t2 - t1, x);++ rdtscll(t1);+ rdtscll(t2);+ printf("Cost of rdtsc (macro): %lld\n", t2 - t1);+ return 0;+}