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Userland: Move command-line utilities to Userland/Utilities/
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142 changed files with 58 additions and 58 deletions
130
Userland/Utilities/allocate.cpp
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130
Userland/Utilities/allocate.cpp
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <LibCore/ElapsedTimer.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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static void usage()
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{
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printf("usage: allocate [number [unit (B/KiB/MiB)]]\n");
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exit(1);
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}
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enum class Unit {
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Bytes,
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KiB,
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MiB,
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};
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int main(int argc, char** argv)
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{
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int count = 50;
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auto unit = Unit::MiB;
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if (argc >= 2) {
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auto number = String(argv[1]).to_uint();
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if (!number.has_value()) {
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usage();
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}
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count = number.value();
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}
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if (argc >= 3) {
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if (strcmp(argv[2], "B") == 0)
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unit = Unit::Bytes;
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else if (strcmp(argv[2], "KiB") == 0)
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unit = Unit::KiB;
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else if (strcmp(argv[2], "MiB") == 0)
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unit = Unit::MiB;
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else
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usage();
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}
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switch (unit) {
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case Unit::Bytes:
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break;
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case Unit::KiB:
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count *= KiB;
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break;
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case Unit::MiB:
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count *= MiB;
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break;
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}
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Core::ElapsedTimer timer;
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printf("allocating memory (%d bytes)...\n", count);
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timer.start();
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char* ptr = (char*)malloc(count);
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if (!ptr) {
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printf("failed.\n");
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return 1;
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}
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printf("done in %dms\n", timer.elapsed());
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auto pages = count / PAGE_SIZE;
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auto step = pages / 10;
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Core::ElapsedTimer timer2;
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printf("writing one byte to each page of allocated memory...\n");
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timer.start();
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timer2.start();
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for (int i = 0; i < pages; ++i) {
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ptr[i * PAGE_SIZE] = 1;
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if (i != 0 && (i % step) == 0) {
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auto ms = timer2.elapsed();
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if (ms == 0)
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ms = 1;
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auto bps = double(step * PAGE_SIZE) / (double(ms) / 1000);
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printf("step took %dms (%fMiB/s)\n", ms, bps / MiB);
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timer2.start();
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}
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}
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printf("done in %dms\n", timer.elapsed());
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printf("sleeping for ten seconds...\n");
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for (int i = 0; i < 10; i++) {
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printf("%d\n", i);
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sleep(1);
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}
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printf("done.\n");
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printf("freeing memory...\n");
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timer.start();
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free(ptr);
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printf("done in %dms\n", timer.elapsed());
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return 0;
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}
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