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https://github.com/openvswitch/ovs
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eadd16449c
Improve link speed by linking 29 test programs into ovstest. On my machine, running the following command against a fully built tree: $ touch lib/random.c; time make Improve the overall build time from 7 seconds to 3.5 seconds. Signed-off-by: Andy Zhou <azhou@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2014 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "random.h"
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#include "ovstest.h"
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#include <stdio.h>
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#include <string.h>
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static void
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test_random_main(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
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{
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enum { N_ROUNDS = 10000 };
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unsigned long long int total;
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int hist16[8][16];
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int hist2[32];
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int i;
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random_set_seed(1);
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total = 0;
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memset(hist2, 0, sizeof hist2);
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memset(hist16, 0, sizeof hist16);
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for (i = 0; i < N_ROUNDS; i++) {
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uint32_t x;
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int j;
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x = random_uint32();
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total += x;
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for (j = 0; j < 32; j++) {
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if (x & (1u << j)) {
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hist2[j]++;
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}
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}
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for (j = 0; j < 8; j++) {
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hist16[j][(x >> (j * 4)) & 15]++;
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}
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}
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printf("average=%08llx\n", total / N_ROUNDS);
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printf("\nbit 0 1\n");
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for (i = 0; i < 32; i++) {
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printf("%3d %5d %5d\n", i, N_ROUNDS - hist2[i], hist2[i]);
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}
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printf("(expected values are %d)\n", N_ROUNDS / 2);
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printf("\nnibble 0 1 2 3 4 5 6 7 8 9 10 11 12 "
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"13 14 15\n");
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for (i = 0; i < 8; i++) {
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int j;
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printf("%6d", i);
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for (j = 0; j < 16; j++) {
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printf(" %3d", hist16[i][j]);
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}
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printf("\n");
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}
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printf("(expected values are %d)\n", N_ROUNDS / 16);
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}
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OVSTEST_REGISTER("test-random", test_random_main);
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