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| author | Frans Kaashoek <kaashoek@26.sub-75-251-10.myvzw.com> | 2011-08-08 09:20:29 -0400 |
|---|---|---|
| committer | Frans Kaashoek <kaashoek@26.sub-75-251-10.myvzw.com> | 2011-08-08 09:20:29 -0400 |
| commit | 11b7438b1046eecca6135b52ddbe686008099fa5 (patch) | |
| tree | 5923c519d8b2ef99a445e29281cbbb455afe52d4 /usertests.c | |
| parent | 6479766334c6eb6ff9325ffa097dc6aece9e7af9 (diff) | |
| download | xv6-labs-11b7438b1046eecca6135b52ddbe686008099fa5.tar.gz xv6-labs-11b7438b1046eecca6135b52ddbe686008099fa5.tar.bz2 xv6-labs-11b7438b1046eecca6135b52ddbe686008099fa5.zip | |
Speedup sbrk tst a bit (forking 100Mbyte processes is slow)
Diffstat (limited to 'usertests.c')
| -rw-r--r-- | usertests.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/usertests.c b/usertests.c index 0d5d4dc..3bffadb 100644 --- a/usertests.c +++ b/usertests.c @@ -1238,7 +1238,7 @@ forktest(void) void sbrktest(void) { - int fds[2], pid, pids[32], ppid; + int fds[2], pid, pids[10], ppid; char *a, *b, *c, *lastaddr, *oldbrk, *p, scratch; uint amt; @@ -1310,6 +1310,13 @@ sbrktest(void) exit(); } + a = sbrk(0); + c = sbrk(-(sbrk(0) - oldbrk)); + if(c != a){ + printf(stdout, "sbrk downsize failed, a %x c %x\n", a, c); + exit(); + } + // can we read the kernel's memory? for(a = (char*)(KERNBASE); a < (char*) (KERNBASE+2000000); a += 50000){ ppid = getpid(); @@ -1328,15 +1335,14 @@ sbrktest(void) // if we run the system out of memory, does it clean up the last // failed allocation? - sbrk(-(sbrk(0) - oldbrk)); if(pipe(fds) != 0){ printf(1, "pipe() failed\n"); exit(); } for(i = 0; i < sizeof(pids)/sizeof(pids[0]); i++){ if((pids[i] = fork()) == 0){ - // allocate the full 640K - sbrk((640 * 1024) - (uint)sbrk(0)); + // allocate a lot of memory + sbrk(BIG - (uint)sbrk(0)); write(fds[1], "x", 1); // sit around until killed for(;;) sleep(1000); |