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Collin Funk
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* Test pagealign_alloc module.
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Copyright (C) 2025-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2025. */
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#include <config.h>
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/* Specification. */
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#include "pagealign_alloc.h"
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/* This test verifies that allocating and then freeing N pages is O(N),
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not O(N²). */
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "xalloc.h"
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int
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main (int argc, char *argv[])
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{
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#if HAVE_DECL_ALARM
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/* Declare failure if test takes too long, by using default abort
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caused by SIGALRM.
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On a fast x86_64 machine in 2025, with the PA_IMPL_MALLOC implementation,
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the execution times are:
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n | time | time |
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| linear list | hash set |
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-------+-------------+----------+
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10000 | 0.15 sec | 0.03 sec |
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25000 | 0.8 sec | 0.07 sec |
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50000 | 3.1 sec | 0.13 sec |
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100000 | 14 sec | 0.26 sec |
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*/
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int alarm_value = 10;
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signal (SIGALRM, SIG_DFL);
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alarm (alarm_value);
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#endif
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int n;
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if (argc > 1)
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n = atoi (argv[1]);
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else
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{
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#if defined __CYGWIN__
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n = 25000;
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#else
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n = (sizeof (void *) <= 4 ? 25000 : 50000);
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#endif
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}
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void **pages = XNMALLOC (n, void *);
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size_t pagesize = getpagesize ();
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for (int i = 0; i < n; i++)
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pages[i] = pagealign_xalloc (pagesize);
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/* Free half of the pages in allocation order and the other half of the pages
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in reverse allocation order. */
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int half = n / 2;
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for (int i = 0; i < half; i++)
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pagealign_free (pages[i]);
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for (int i = n - 1; i >= half; i--)
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pagealign_free (pages[i]);
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return 0;
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}
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