83 lines
2.0 KiB
Plaintext
83 lines
2.0 KiB
Plaintext
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--- startpar.c 2008-07-18 13:25:50.000000000 +0200
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+++ startpar.c 2009-02-12 14:49:10.987760000 +0100
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@@ -29,6 +29,8 @@
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#include <sys/select.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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+#include <sys/socket.h>
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+#include <sys/un.h>
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#include <sys/sysinfo.h>
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#include <sys/stat.h>
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#include <time.h>
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@@ -64,6 +66,8 @@
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static char *run_mode = NULL;
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static struct makenode **nodevec;
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+static enum { Unknown, Preload, NoPreload } ispreload = Unknown;
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+
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#define PBUF_SIZE 8192
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struct prg {
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char *name;
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@@ -248,6 +252,10 @@
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if (read_proc(&prcs_run, &prcs_blked))
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return par;
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+ /* if we have preload running, we expect I/O not to be a problem */
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+ if (ispreload == Preload)
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+ prcs_blked = 0;
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+
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newpar = (par*numcpu) - prcs_run + 1; /* +1 for startpar its self */
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newpar -= (int)(((double)prcs_blked)*iorate); /* I/O load reduction */
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@@ -271,6 +279,8 @@
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return checksystem(par, start, false);
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}
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+#define SOCK_PATH "/dev/shm/preload_sock"
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+
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void run(struct prg *p)
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{
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char *m = 0;
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@@ -341,6 +351,40 @@
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closeall();
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+ if (!strcmp(arg, "start"))
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+ {
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+ int s, t, len;
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+ struct sockaddr_un remote;
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+ char str[100];
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+
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+ s = socket(AF_UNIX, SOCK_STREAM, 0);
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+ if (s != -1)
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+ {
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+ memset(&remote, 0, sizeof(struct sockaddr_un));
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+ remote.sun_family = AF_UNIX;
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+ strcpy(remote.sun_path, SOCK_PATH);
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+ len = strlen(remote.sun_path) + sizeof(remote.sun_family);
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+
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+ t = connect(s, (struct sockaddr *)&remote, len);
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+ if (t != -1)
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+ {
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+ ispreload = Preload;
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+ send(s, p->name, strlen(p->name), 0);
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+ recv(s, str, 100, 0);
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+ }
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+ else if ( ispreload == Unknown)
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+ {
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+ /*
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+ * if we connected to preload once, we know it ran.
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+ * In case we can't connect to it later, it means it did
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+ * its job and we can guess I/O is no longer a problem.
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+ */
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+ ispreload = NoPreload;
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+ }
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+ close(s);
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+ }
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+ }
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+
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if (run_mode)
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{
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char path[128];
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