mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 15:40:19 +00:00
765936ebae
Problem: - `(void)` simply casts the expression to void. This is understood to indicate that it is ignored, but this is really a compiler trick to get the compiler to not generate a warning. Solution: - Use the `[[maybe_unused]]` attribute to indicate the value is unused. Note: - Functions taking a `(void)` argument list have also been changed to `()` because this is not needed and shows up in the same grep command.
130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
/*
|
|
* 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>
|
|
|
|
static void usage()
|
|
{
|
|
printf("usage: allocate [number [unit (B/KiB/MiB)]]\n");
|
|
exit(1);
|
|
}
|
|
|
|
enum class Unit {
|
|
Bytes,
|
|
KiB,
|
|
MiB,
|
|
};
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
int count = 50;
|
|
auto unit = Unit::MiB;
|
|
|
|
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 = Unit::Bytes;
|
|
else if (strcmp(argv[2], "KiB") == 0)
|
|
unit = Unit::KiB;
|
|
else if (strcmp(argv[2], "MiB") == 0)
|
|
unit = Unit::MiB;
|
|
else
|
|
usage();
|
|
}
|
|
|
|
switch (unit) {
|
|
case Unit::Bytes:
|
|
break;
|
|
case Unit::KiB:
|
|
count *= KiB;
|
|
break;
|
|
case Unit::MiB:
|
|
count *= MiB;
|
|
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 / PAGE_SIZE;
|
|
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 * PAGE_SIZE] = 1;
|
|
|
|
if (i != 0 && (i % step) == 0) {
|
|
auto ms = timer2.elapsed();
|
|
if (ms == 0)
|
|
ms = 1;
|
|
|
|
auto bps = double(step * PAGE_SIZE) / (double(ms) / 1000);
|
|
|
|
printf("step took %dms (%fMiB/s)\n", ms, bps / MiB);
|
|
|
|
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;
|
|
}
|