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73fdbba59c
This was a workaround to be able to build on case-insensitive file systems where it might get confused about <string.h> vs <String.h>. Let's just not support building that way, so String.h can have an objectively nicer name. :^)
99 lines
2.0 KiB
C++
99 lines
2.0 KiB
C++
#include <AK/String.h>
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#include <LibCore/CElapsedTimer.h>
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#include <stdio.h>
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#include <unistd.h>
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void usage(void)
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{
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printf("usage: allocate [number [unit (B/KB/MB)]]\n");
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exit(1);
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}
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enum Unit { Bytes, KiloBytes, MegaBytes };
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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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Unit unit = MegaBytes;
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if (argc >= 2) {
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bool ok;
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count = String(argv[1]).to_uint(ok);
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if (!ok) {
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usage();
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}
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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 = Bytes;
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else if (strcmp(argv[2], "KB") == 0)
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unit = KiloBytes;
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else if (strcmp(argv[2], "MB") == 0)
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unit = MegaBytes;
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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 Bytes:
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break;
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case KiloBytes:
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count *= 1024;
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break;
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case MegaBytes:
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count *= 1024 * 1024;
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break;
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}
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CElapsedTimer 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 / 4096;
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auto step = pages / 10;
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CElapsedTimer 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 * 4096] = 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 * 4096) / (double(ms) / 1000);
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printf("step took %dms (%fMB/s)\n", ms, bps / 1024 / 1024);
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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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