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fa9aecc045
Measure duration of 100 fclose calls after opening 1 million FILEs. Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* Benchmark fclose.
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Copyright (C) 2024 Free Software Foundation, Inc.
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Copyright The GNU Toolchain Authors.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "bench-timing.h"
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#include "json-lib.h"
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#define NUM_FILES 1000000
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#define NUM_FCLOSE 100
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int
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main (int argc, char **argv)
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{
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json_ctx_t json_ctx;
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json_init (&json_ctx, 0, stdout);
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json_document_begin (&json_ctx);
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json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
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json_attr_object_begin (&json_ctx, "functions");
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json_attr_object_begin (&json_ctx, "fclose");
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FILE *ff, *keep[NUM_FCLOSE];
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int i;
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for (i = 0; i < NUM_FILES; i++)
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{
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ff = fdopen (STDIN_FILENO, "r");
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if (!ff)
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{
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fprintf (stderr, "### failed to fdopen: %m\n");
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return EXIT_FAILURE;
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}
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if (i < NUM_FCLOSE)
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keep[i] = ff;
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}
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timing_t start, stop, elapsed;
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TIMING_NOW (start);
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for (i = 0; i < NUM_FCLOSE; i++)
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fclose (keep[i]);
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TIMING_NOW (stop);
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TIMING_DIFF (elapsed, start, stop);
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json_attr_uint (&json_ctx, "number of FILEs", NUM_FILES);
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json_attr_uint (&json_ctx, "number of fclose calls", NUM_FCLOSE);
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json_attr_uint (&json_ctx, "duration", elapsed);
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json_attr_object_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_document_end (&json_ctx);
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return 0;
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}
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