From 6640620ba0c42196ad66f339e15f46d5ac95974d Mon Sep 17 00:00:00 2001
From: nathan <nathan>
Date: Tue, 7 Dec 2004 22:09:17 +0000
Subject: [PATCH] Branch b_B1_4_BUG4834 b=4834 Adding tests for MDS and OST
 forced failure under load to recovery-small.sh

---
 lustre/tests/writemany.c | 184 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 lustre/tests/writemany.c

diff --git a/lustre/tests/writemany.c b/lustre/tests/writemany.c
new file mode 100644
index 0000000..ca09c63
--- /dev/null
+++ b/lustre/tests/writemany.c
@@ -0,0 +1,184 @@
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <sys/time.h>
+
+
+#define difftime(a, b)                                          \
+        ((double)(a)->tv_sec - (b)->tv_sec +                    \
+         ((double)((a)->tv_usec - (b)->tv_usec) / 1000000))
+
+char cmdname[512];
+
+int wait_for_threads(int live_threads)
+{
+        int rc = 0;
+        
+        while (live_threads > 0) {
+                int status;
+                pid_t ret;
+                
+                ret = waitpid(0, &status, 0);
+                if (ret == 0) {
+                        continue;
+                }
+                
+                if (ret < 0) {
+                        fprintf(stderr, "%s: error: wait - %s\n",
+                                cmdname, strerror(errno));
+                        if (!rc)
+                                rc = errno;
+                } else {
+                        /*
+                         * This is a hack.  We _should_ be able to use
+                         * WIFEXITED(status) to see if there was an
+                         * error, but it appears to be broken and it
+                         * always returns 1 (OK).  See wait(2).
+                         */
+                        int err = WEXITSTATUS(status);
+                        if (err || WIFSIGNALED(status))
+                                fprintf(stderr,
+                                        "%s: error: PID %d had rc=%d\n",
+                                        cmdname, ret, err);
+                        if (!rc)
+                                rc = err;
+                        
+                        live_threads--;
+                }
+        }
+        printf("%s done, rc = %d\n", cmdname, rc);
+        return rc;
+}
+
+
+int run_one_child(char *file, int thread, int seconds)
+{
+        struct timeval start, cur;
+        double diff;
+        char filename[1024];
+        char buf[1024];
+        int fd, rc = 0, rand, maxrand, len;
+        long nfiles = 0, nbytes = 0;
+
+        printf("%s: running thread #%d\n", cmdname, thread);
+        
+        srandom(thread);
+        /* Higher thread numbers will produce bigger random files.  
+           Thread 1 will produce only 0-len files. */
+        maxrand = 1; rand = thread;
+        while (--rand)
+                maxrand *= 10;
+
+        gettimeofday(&start, NULL);
+
+        while(!rc) {
+                gettimeofday(&cur, NULL);
+                if (cur.tv_sec > (start.tv_sec + seconds))
+                        break;
+
+                sprintf(filename, "%s-%d-%ld", file, thread, nfiles);
+                
+                fd = open(filename, O_RDWR | O_CREAT, 0666);
+                if (fd < 0) {
+                        fprintf(stderr, "%s: error: open(%s): %s\n",
+                                cmdname, filename, strerror(errno));
+                        rc = errno;
+                        break;
+                }
+                
+                sprintf(buf, "%s %010ld %.19s.%012d\n", cmdname, 
+                        nfiles++, ctime(&cur.tv_sec), (int)cur.tv_usec);
+                len = strlen(buf);
+
+                rand = random() % maxrand;
+                while (rand-- > 0) {
+                        if (write(fd, buf, len) != len) {
+                                fprintf(stderr, "%s: error: write(%s): %s\n",
+                                        cmdname, filename, strerror(errno));
+                                rc = errno;
+                                break;
+                        }                     
+                        nbytes += len;
+                }  
+                
+                if (close(fd) < 0) {
+                        fprintf(stderr, "%s: error: close(%s): %s\n",
+                                cmdname, filename, strerror(errno));
+                        rc = errno;
+                        break;
+                }
+                if (unlink(filename) < 0) {
+                        fprintf(stderr, "%s: error: unlink(%s): %s\n",
+                                cmdname, filename, strerror(errno));
+                        rc = errno;
+                        break;
+                }
+        }
+        
+        diff = difftime(&cur, &start);
+        printf("%s: %7ld files, %4ld MB in %.2fs (%7.2f files/s, %5.2f MB/s): rc = %d\n",
+               cmdname, nfiles, nbytes >> 20, diff,
+               (double)nfiles / diff, (double)nbytes/1024/1024 / diff, rc);
+
+        return rc;
+}
+
+
+
+int main(int argc, char *argv[])
+{
+        unsigned long duration;
+        int threads = 0;
+        char *end;
+        int i, rc = 0;
+
+        if (argc != 4) {
+                fprintf(stderr,
+                        "usage: %s <filename> <seconds> <threads>\n",
+                        argv[0]);
+                exit(1);
+        }
+
+        sprintf(cmdname, "%s", argv[0]);        
+
+        duration = strtoul(argv[2], &end, 0);
+        if (*end) {
+                fprintf(stderr, "%s: error: bad number of seconds '%s'\n",
+                        cmdname, argv[1]);
+                exit(2);
+        }
+
+        threads = strtoul(argv[3], &end, 0);
+        if (*end) {
+                fprintf(stderr, "%s: error: bad thread count '%s'\n",
+                        cmdname, argv[3]);
+                exit(2);
+        }
+
+        for (i = 1; i <= threads; i++) {
+                rc = fork();
+                if (rc < 0) {
+                        fprintf(stderr, "%s: error: #%d - %s\n",
+                                cmdname, i, strerror(rc = errno));
+                        return (rc);
+                }
+                if (rc == 0) {
+                        /* children */
+                        sprintf(cmdname, "%s-%d", argv[0], i);
+                        return (run_one_child(argv[1], i, duration));
+                }
+        }
+        /* parent process */
+        printf("%s will run for %ld minutes\n", cmdname, duration/60);
+        return (wait_for_threads(threads));
+}
-- 
1.8.3.1