mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 21:42:43 +00:00
105 lines
2.3 KiB
C++
105 lines
2.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 <LibMain/Main.h>
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#include <unistd.h>
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static void usage()
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{
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warnln("usage: allocate [number [unit (B/KiB/MiB)]]");
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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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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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int count = 50;
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auto unit = Unit::MiB;
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if (arguments.argc >= 2) {
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auto number = arguments.strings[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 (arguments.argc >= 3) {
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if (arguments.strings[2] == "B")
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unit = Unit::Bytes;
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else if (arguments.strings[2] == "KiB")
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unit = Unit::KiB;
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else if (arguments.strings[2] == "MiB")
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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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outln("allocating memory ({} bytes)...", count);
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auto timer = Core::ElapsedTimer::start_new();
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char* ptr = (char*)malloc(count);
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if (!ptr) {
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outln("failed.");
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return 1;
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}
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outln("done in {}ms", timer.elapsed());
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auto pages = count / PAGE_SIZE;
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auto step = pages / 10;
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outln("writing one byte to each page of allocated memory...");
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timer.start();
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auto timer2 = Core::ElapsedTimer::start_new();
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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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outln("step took {}ms ({}MiB/s)", ms, bps / MiB);
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timer2.start();
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}
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}
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outln("done in {}ms", timer.elapsed());
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outln("sleeping for ten seconds...");
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for (int i = 0; i < 10; i++) {
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outln("{}", i);
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sleep(1);
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}
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outln("done.");
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outln("freeing memory...");
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timer.start();
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free(ptr);
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outln("done in {}ms", timer.elapsed());
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return 0;
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}
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