> Author: trasz
> Date: Wed Jul 4 13:34:43 2018
> New Revision: 335941
> URL: https://svnweb.freebsd.org/changeset/base/335941
>
> Log:
> Add a trivial "pipe ping" (two processes) benchmark.
>
> Obtained from: CheriBSD
> MFC after: 2 weeks
> Sponsored by: DARPA, AFRL
>
> Modified:
> head/tools/tools/syscall_timing/syscall_timing.c
>
> Modified: head/tools/tools/syscall_timing/syscall_timing.c
> ==============================================================================
> --- head/tools/tools/syscall_timing/syscall_timing.c Wed Jul 4 13:31:55
> 2018 (r335940)
> +++ head/tools/tools/syscall_timing/syscall_timing.c Wed Jul 4 13:34:43
> 2018 (r335941)
> @@ -31,6 +31,7 @@
>
> #include <sys/types.h>
> #include <sys/mman.h>
> +#include <sys/procdesc.h>
> #include <sys/resource.h>
> #include <sys/socket.h>
> #include <sys/stat.h>
> @@ -251,6 +252,52 @@ test_select(uintmax_t num, uintmax_t int_arg __unused,
> }
>
> static uintmax_t
> +test_pipeping(uintmax_t num, uintmax_t int_arg, const char *path __unused)
> +{
> + char buf[int_arg];
> + uintmax_t i;
> + ssize_t ret;
> + pid_t pid;
> + int fd[2], procfd;
> +
> + if (pipe(fd) < 0)
> + err(-1, "pipe");
> +
> + pid = pdfork(&procfd, 0);
> + if (pid < 0)
> + err(1, "pdfork");
> +
> + if (pid == 0) {
> + close(fd[0]);
> +
> + for (;;) {
> + ret = read(fd[1], buf, int_arg);
> + if ((uintmax_t)ret != int_arg)
> + err(1, "read");
> + ret = write(fd[1], buf, int_arg);
> + if ((uintmax_t)ret != int_arg)
> + err(1, "write");
> + }
> + }
> +
> + close(fd[1]);
> +
> + benchmark_start();
> + BENCHMARK_FOREACH(i, num) {
> + ret = write(fd[0], buf, int_arg);
> + if ((uintmax_t)ret != int_arg)
> + err(1, "write");
> + ret = read(fd[0], buf, int_arg);
> + if ((uintmax_t)ret != int_arg)
> + err(1, "read");
> + }
> + benchmark_stop();
> +
> + close(procfd);
> + return (i);
> +}
> +
> +static uintmax_t
> test_socket_stream(uintmax_t num, uintmax_t int_arg, const char *path
> __unused)
> {
> uintmax_t i;
> @@ -694,6 +741,18 @@ static const struct test tests[] = {
> { "getppid", test_getppid, .t_flags = 0 },
> { "getresuid", test_getresuid, .t_flags = 0 },
> { "clock_gettime", test_clock_gettime, .t_flags = 0 },
> + { "pipeping_1", test_pipeping, .t_flags = 0, .t_int = 1 },
> + { "pipeping_10", test_pipeping, .t_flags = 0, .t_int = 10 },
> + { "pipeping_100", test_pipeping, .t_flags = 0, .t_int = 100 },
> + { "pipeping_1000", test_pipeping, .t_flags = 0, .t_int = 1000 },
> + { "pipeping_10000", test_pipeping, .t_flags = 0, .t_int = 10000 },
> +#ifdef notyet
> + /*
> + * XXX: Doesn't work; kernel pipe buffer too small?
> + */
> + { "pipeping_100000", test_pipeping, .t_flags = 0, .t_int = 100000 },
> + { "pipeping_1000000", test_pipeping, .t_flags = 0, .t_int = 1000000 },
> + #endif
Can you get the size of the pipe buffer and make a run time
decision on this? Not all of us run with defaults....
Hum, does not seem it is easy to get this pipe size info from userland...
> { "gettimeofday", test_gettimeofday, .t_flags = 0 },
> { "getpriority", test_getpriority, .t_flags = 0 },
> { "getprogname", test_getprogname, .t_flags = 0 },
>
>
--
Rod Grimes rgri...@freebsd.org
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