summaryrefslogtreecommitdiffstats
path: root/netwerk/test/TestWriteSpeed.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'netwerk/test/TestWriteSpeed.cpp')
-rw-r--r--netwerk/test/TestWriteSpeed.cpp116
1 files changed, 116 insertions, 0 deletions
diff --git a/netwerk/test/TestWriteSpeed.cpp b/netwerk/test/TestWriteSpeed.cpp
new file mode 100644
index 000000000..0b0260fdd
--- /dev/null
+++ b/netwerk/test/TestWriteSpeed.cpp
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "prio.h"
+#include "prinrval.h"
+#include "prmem.h"
+#include <stdio.h>
+#include <math.h>
+
+void
+NS_MeanAndStdDev(double n, double sumOfValues, double sumOfSquaredValues,
+ double *meanResult, double *stdDevResult)
+{
+ double mean = 0.0, var = 0.0, stdDev = 0.0;
+ if (n > 0.0 && sumOfValues >= 0) {
+ mean = sumOfValues / n;
+ double temp = (n * sumOfSquaredValues) - (sumOfValues * sumOfValues);
+ if (temp < 0.0 || n <= 1)
+ var = 0.0;
+ else
+ var = temp / (n * (n - 1));
+ // for some reason, Windows says sqrt(0.0) is "-1.#J" (?!) so do this:
+ stdDev = var != 0.0 ? sqrt(var) : 0.0;
+ }
+ *meanResult = mean;
+ *stdDevResult = stdDev;
+}
+
+int
+Test(const char* filename, int32_t minSize, int32_t maxSize,
+ int32_t sizeIncrement, int32_t iterations)
+{
+ fprintf(stdout, " size write: mean stddev iters total: mean stddev iters\n");
+ for (int32_t size = minSize; size <= maxSize; size += sizeIncrement) {
+ // create a buffer of stuff to write
+ char* buf = (char*)PR_Malloc(size);
+ if (buf == nullptr)
+ return -1;
+
+ // initialize it with a pattern
+ int32_t i;
+ char hex[] = "0123456789ABCDEF";
+ for (i = 0; i < size; i++) {
+ buf[i] = hex[i & 0xF];
+ }
+
+ double writeCount = 0, writeRate = 0, writeRateSquared = 0;
+ double totalCount = 0, totalRate = 0, totalRateSquared = 0;
+ for (i = 0; i < iterations; i++) {
+ PRIntervalTime start = PR_IntervalNow();
+
+ char name[1024];
+ sprintf(name, "%s_%d", filename, i);
+ PRFileDesc* fd = PR_Open(name, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE, 0664);
+ if (fd == nullptr)
+ return -1;
+
+ PRIntervalTime writeStart = PR_IntervalNow();
+ int32_t rv = PR_Write(fd, buf, size);
+ if (rv < 0) return rv;
+ if (rv != size) return -1;
+ PRIntervalTime writeStop = PR_IntervalNow();
+
+ PRStatus st = PR_Close(fd);
+ if (st == PR_FAILURE) return -1;
+
+ PRIntervalTime stop = PR_IntervalNow();
+
+ PRIntervalTime writeTime = PR_IntervalToMilliseconds(writeStop - writeStart);
+ if (writeTime > 0) {
+ double wr = size / writeTime;
+ writeRate += wr;
+ writeRateSquared += wr * wr;
+ writeCount++;
+ }
+
+ PRIntervalTime totalTime = PR_IntervalToMilliseconds(stop - start);
+ if (totalTime > 0) {
+ double t = size / totalTime;
+ totalRate += t;
+ totalRateSquared += t * t;
+ totalCount++;
+ }
+ }
+
+ PR_Free(buf);
+
+ double writeMean, writeStddev;
+ double totalMean, totalStddev;
+ NS_MeanAndStdDev(writeCount, writeRate, writeRateSquared,
+ &writeMean, &writeStddev);
+ NS_MeanAndStdDev(totalCount, totalRate, totalRateSquared,
+ &totalMean, &totalStddev);
+ fprintf(stdout, "%10d %10.2f %10.2f %10d %10.2f %10.2f %10d\n",
+ size, writeMean, writeStddev, (int32_t)writeCount,
+ totalMean, totalStddev, (int32_t)totalCount);
+ }
+ return 0;
+}
+
+int
+main(int argc, char* argv[])
+{
+ if (argc != 5) {
+ printf("usage: %s <min buf size (K)> <max buf size (K)> <size increment (K)> <iterations>\n", argv[0]);
+ return -1;
+ }
+ Test("y:\\foo",
+ atoi(argv[1]) * 1024,
+ atoi(argv[2]) * 1024,
+ atoi(argv[3]) * 1024,
+ atoi(argv[4]));
+ return 0;
+}