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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Optional.h>
#include <AK/String.h>
#include <LibCore/ElapsedTimer.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
void usage(void)
{
printf("usage: allocate [number [unit (B/KB/MB)]]\n");
exit(1);
}
enum Unit { Bytes,
KiloBytes,
MegaBytes };
int main(int argc, char** argv)
{
int count = 50;
Unit unit = MegaBytes;
if (argc >= 2) {
auto number = String(argv[1]).to_uint();
if (!number.has_value()) {
usage();
}
count = number.value();
}
if (argc >= 3) {
if (strcmp(argv[2], "B") == 0)
unit = Bytes;
else if (strcmp(argv[2], "KB") == 0)
unit = KiloBytes;
else if (strcmp(argv[2], "MB") == 0)
unit = MegaBytes;
else
usage();
}
switch (unit) {
case Bytes:
break;
case KiloBytes:
count *= 1024;
break;
case MegaBytes:
count *= 1024 * 1024;
break;
}
Core::ElapsedTimer timer;
printf("allocating memory (%d bytes)...\n", count);
timer.start();
char* ptr = (char*)malloc(count);
if (!ptr) {
printf("failed.\n");
return 1;
}
printf("done in %dms\n", timer.elapsed());
auto pages = count / 4096;
auto step = pages / 10;
Core::ElapsedTimer timer2;
printf("writing one byte to each page of allocated memory...\n");
timer.start();
timer2.start();
for (int i = 0; i < pages; ++i) {
ptr[i * 4096] = 1;
if (i != 0 && (i % step) == 0) {
auto ms = timer2.elapsed();
if (ms == 0)
ms = 1;
auto bps = double(step * 4096) / (double(ms) / 1000);
printf("step took %dms (%fMB/s)\n", ms, bps / 1024 / 1024);
timer2.start();
}
}
printf("done in %dms\n", timer.elapsed());
printf("sleeping for ten seconds...\n");
for (int i = 0; i < 10; i++) {
printf("%d\n", i);
sleep(1);
}
printf("done.\n");
printf("freeing memory...\n");
timer.start();
free(ptr);
printf("done in %dms\n", timer.elapsed());
return 0;
}
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