diff options
Diffstat (limited to 'gnu/packages')
| -rw-r--r-- | gnu/packages/libunistring.scm | 8 | ||||
| -rw-r--r-- | gnu/packages/patches/libunistring-gnulib-multi-core.patch | 178 |
2 files changed, 185 insertions, 1 deletions
diff --git a/gnu/packages/libunistring.scm b/gnu/packages/libunistring.scm index 212bec4b49..df02f68cea 100644 --- a/gnu/packages/libunistring.scm +++ b/gnu/packages/libunistring.scm @@ -3,6 +3,7 @@ ;;; Copyright © 2015 Mark H Weaver <mhw@netris.org> ;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il> ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org> +;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> ;;; ;;; This file is part of GNU Guix. ;;; @@ -24,6 +25,7 @@ #:use-module (guix packages) #:use-module (guix download) #:use-module (guix build-system gnu) + #:use-module (gnu packages) #:use-module (gnu packages base)) (define-public libunistring @@ -37,7 +39,11 @@ version ".tar.xz")) (sha256 (base32 - "15z76qrmrvkc3c6hfq2lzzqysgd21s682f2smycfab5g598n8drf")))) + "15z76qrmrvkc3c6hfq2lzzqysgd21s682f2smycfab5g598n8drf")) + ;; test-lock has performance issues on multi-core machines, + ;; it hangs or takes a long time to complete. + ;; This is a commit from gnulib to fix this issue. + (patches (search-patches "libunistring-gnulib-multi-core.patch")))) (propagated-inputs (libiconv-if-needed)) (build-system gnu-build-system) (arguments diff --git a/gnu/packages/patches/libunistring-gnulib-multi-core.patch b/gnu/packages/patches/libunistring-gnulib-multi-core.patch new file mode 100644 index 0000000000..709b20c6d2 --- /dev/null +++ b/gnu/packages/patches/libunistring-gnulib-multi-core.patch @@ -0,0 +1,178 @@ +This patch fixes performance problems on multi-core machines +as reported at <https://bugs.gnu.org/26441>. + +See commit 480d374e596a0ee3fed168ab42cd84c313ad3c89 in Gnulib +by Bruno Haible <bruno@clisp.org>. + +diff --git a/tests/test-lock.c b/tests/test-lock.c +index cb734b4e6..aa6de2739 100644 +--- a/tests/test-lock.c ++++ b/tests/test-lock.c +@@ -50,6 +50,13 @@ + Uncomment this to see if the operating system has a fair scheduler. */ + #define EXPLICIT_YIELD 1 + ++/* Whether to use 'volatile' on some variables that communicate information ++ between threads. If set to 0, a lock is used to protect these variables. ++ If set to 1, 'volatile' is used; this is theoretically equivalent but can ++ lead to much slower execution (e.g. 30x slower total run time on a 40-core ++ machine. */ ++#define USE_VOLATILE 0 ++ + /* Whether to print debugging messages. */ + #define ENABLE_DEBUGGING 0 + +@@ -103,6 +110,51 @@ + # define yield() + #endif + ++#if USE_VOLATILE ++struct atomic_int { ++ volatile int value; ++}; ++static void ++init_atomic_int (struct atomic_int *ai) ++{ ++} ++static int ++get_atomic_int_value (struct atomic_int *ai) ++{ ++ return ai->value; ++} ++static void ++set_atomic_int_value (struct atomic_int *ai, int new_value) ++{ ++ ai->value = new_value; ++} ++#else ++struct atomic_int { ++ gl_lock_define (, lock) ++ int value; ++}; ++static void ++init_atomic_int (struct atomic_int *ai) ++{ ++ gl_lock_init (ai->lock); ++} ++static int ++get_atomic_int_value (struct atomic_int *ai) ++{ ++ gl_lock_lock (ai->lock); ++ int ret = ai->value; ++ gl_lock_unlock (ai->lock); ++ return ret; ++} ++static void ++set_atomic_int_value (struct atomic_int *ai, int new_value) ++{ ++ gl_lock_lock (ai->lock); ++ ai->value = new_value; ++ gl_lock_unlock (ai->lock); ++} ++#endif ++ + #define ACCOUNT_COUNT 4 + + static int account[ACCOUNT_COUNT]; +@@ -170,12 +222,12 @@ lock_mutator_thread (void *arg) + return NULL; + } + +-static volatile int lock_checker_done; ++static struct atomic_int lock_checker_done; + + static void * + lock_checker_thread (void *arg) + { +- while (!lock_checker_done) ++ while (get_atomic_int_value (&lock_checker_done) == 0) + { + dbgprintf ("Checker %p before check lock\n", gl_thread_self_pointer ()); + gl_lock_lock (my_lock); +@@ -200,7 +252,8 @@ test_lock (void) + /* Initialization. */ + for (i = 0; i < ACCOUNT_COUNT; i++) + account[i] = 1000; +- lock_checker_done = 0; ++ init_atomic_int (&lock_checker_done); ++ set_atomic_int_value (&lock_checker_done, 0); + + /* Spawn the threads. */ + checkerthread = gl_thread_create (lock_checker_thread, NULL); +@@ -210,7 +263,7 @@ test_lock (void) + /* Wait for the threads to terminate. */ + for (i = 0; i < THREAD_COUNT; i++) + gl_thread_join (threads[i], NULL); +- lock_checker_done = 1; ++ set_atomic_int_value (&lock_checker_done, 1); + gl_thread_join (checkerthread, NULL); + check_accounts (); + } +@@ -254,12 +307,12 @@ rwlock_mutator_thread (void *arg) + return NULL; + } + +-static volatile int rwlock_checker_done; ++static struct atomic_int rwlock_checker_done; + + static void * + rwlock_checker_thread (void *arg) + { +- while (!rwlock_checker_done) ++ while (get_atomic_int_value (&rwlock_checker_done) == 0) + { + dbgprintf ("Checker %p before check rdlock\n", gl_thread_self_pointer ()); + gl_rwlock_rdlock (my_rwlock); +@@ -284,7 +337,8 @@ test_rwlock (void) + /* Initialization. */ + for (i = 0; i < ACCOUNT_COUNT; i++) + account[i] = 1000; +- rwlock_checker_done = 0; ++ init_atomic_int (&rwlock_checker_done); ++ set_atomic_int_value (&rwlock_checker_done, 0); + + /* Spawn the threads. */ + for (i = 0; i < THREAD_COUNT; i++) +@@ -295,7 +349,7 @@ test_rwlock (void) + /* Wait for the threads to terminate. */ + for (i = 0; i < THREAD_COUNT; i++) + gl_thread_join (threads[i], NULL); +- rwlock_checker_done = 1; ++ set_atomic_int_value (&rwlock_checker_done, 1); + for (i = 0; i < THREAD_COUNT; i++) + gl_thread_join (checkerthreads[i], NULL); + check_accounts (); +@@ -356,12 +410,12 @@ reclock_mutator_thread (void *arg) + return NULL; + } + +-static volatile int reclock_checker_done; ++static struct atomic_int reclock_checker_done; + + static void * + reclock_checker_thread (void *arg) + { +- while (!reclock_checker_done) ++ while (get_atomic_int_value (&reclock_checker_done) == 0) + { + dbgprintf ("Checker %p before check lock\n", gl_thread_self_pointer ()); + gl_recursive_lock_lock (my_reclock); +@@ -386,7 +440,8 @@ test_recursive_lock (void) + /* Initialization. */ + for (i = 0; i < ACCOUNT_COUNT; i++) + account[i] = 1000; +- reclock_checker_done = 0; ++ init_atomic_int (&reclock_checker_done); ++ set_atomic_int_value (&reclock_checker_done, 0); + + /* Spawn the threads. */ + checkerthread = gl_thread_create (reclock_checker_thread, NULL); +@@ -396,7 +451,7 @@ test_recursive_lock (void) + /* Wait for the threads to terminate. */ + for (i = 0; i < THREAD_COUNT; i++) + gl_thread_join (threads[i], NULL); +- reclock_checker_done = 1; ++ set_atomic_int_value (&reclock_checker_done, 1); + gl_thread_join (checkerthread, NULL); + check_accounts (); + } |