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Would be nice to have some sort of canonical definition

of server loading for Apache. So create a struct that
holds some useful data. The hope is that for those
platforms that lack getloadavg(), people will write
replacements.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1389481 13f79535-47bb-0310-9956-ffa450edef68
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1 parent 663edfd commit eedcb57b8f95f3e82aed53bfeb51559e3f031208 @jimjag jimjag committed Sep 24, 2012
Showing with 92 additions and 1 deletion.
  1. +2 −1 configure.in
  2. +23 −0 include/httpd.h
  3. +5 −0 modules/generators/mod_status.c
  4. +62 −0 server/util.c
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@@ -483,7 +483,8 @@ bindprocessor \
prctl \
timegm \
getpgid \
-fopen64
+fopen64 \
+getloadavg
)
dnl confirm that a void pointer is large enough to store a long integer
View
@@ -1299,6 +1299,24 @@ struct server_rec {
};
/**
+ * @struct server_load_rec
+ * @brief A structure to hold various server load params
+ */
+typedef struct ap_sload_t ap_sload_t;
+struct ap_sload_t {
+ /* 1 min loadavg, ala getloadavg() */
+ float loadavg1;
+ /* 5 min loadavg */
+ float loadavg5;
+ /* 15 min loadavg */
+ float loadavg15;
+ /* percentage of process/threads ready/idle (0->100)*/
+ int idle;
+ /* percentage of process/threads busy (0->100) */
+ int busy;
+};
+
+/**
* Get the context_document_root for a request. This is a generalization of
* the document root, which is too limited in the presence of mappers like
* mod_userdir and mod_alias. The context_document_root is the directory
@@ -2187,6 +2205,11 @@ AP_DECLARE(void *) ap_realloc(void *ptr, size_t size)
AP_FN_ATTR_WARN_UNUSED_RESULT
AP_FN_ATTR_ALLOC_SIZE(2);
+/**
+ * Get server load params
+ * @param ld struct to populate: -1 in fields means error
+ */
+AP_DECLARE(void) ap_get_sload(ap_sload_t *ld);
#define AP_NORESTART APR_OS_START_USEERR + 1
@@ -393,6 +393,8 @@ static int status_handler(request_rec *r)
ap_scoreboard_image->global->restart_time);
if (!short_report) {
+ ap_sload_t t;
+
ap_rputs(DOCTYPE_HTML_3_2
"<html><head>\n"
"<title>Apache Status</title>\n"
@@ -419,6 +421,9 @@ static int status_handler(request_rec *r)
ap_rputs("<dt>Server uptime: ", r);
show_time(r, up_time);
ap_rputs("</dt>\n", r);
+ ap_get_sload(&t);
+ ap_rprintf(r, "<dt>Server load: %.2f %.2f %.2f [%d:%d]</dt>\n",
+ t.loadavg1, t.loadavg5, t.loadavg15, t.idle, t.busy);
}
if (ap_extended_status) {
View
@@ -63,6 +63,8 @@
#include <grp.h>
#endif
+#include "ap_mpm.h"
+
/* A bunch of functions in util.c scan strings looking for certain characters.
* To make that more efficient we encode a lookup table. The test_char_table
* is generated automatically by gen_test_char.c.
@@ -2788,3 +2790,63 @@ AP_DECLARE(void *) ap_realloc(void *ptr, size_t size)
ap_abort_on_oom();
return p;
}
+
+AP_DECLARE(void) ap_get_sload(ap_sload_t *ld)
+{
+ double la[3];
+ int i, j, num, server_limit, thread_limit;
+ int ready = 0;
+ int busy = 0;
+ int total;
+ ap_generation_t mpm_generation;
+
+ /* preload errored fields, we overwrite */
+ ld->loadavg1 = -1.0;
+ ld->loadavg5 = -1.0;
+ ld->loadavg15 = -1.0;
+ ld->idle = -1;
+ ld->busy = -1;
+
+#if HAVE_GETLOADAVG
+ num = getloadavg(la, 3);
+ if (num > 0) {
+ ld->loadavg1 = (float)la[0];
+ }
+ if (num > 1) {
+ ld->loadavg5 = (float)la[1];
+ }
+ if (num > 2) {
+ ld->loadavg15 = (float)la[2];
+ }
+#endif
+ ap_mpm_query(AP_MPMQ_GENERATION, &mpm_generation);
+ ap_mpm_query(AP_MPMQ_HARD_LIMIT_THREADS, &thread_limit);
+ ap_mpm_query(AP_MPMQ_HARD_LIMIT_DAEMONS, &server_limit);
+
+ for (i = 0; i < server_limit; i++) {
+ process_score *ps;
+ ps = ap_get_scoreboard_process(i);
+
+ for (j = 0; j < thread_limit; j++) {
+ int res;
+ worker_score *ws = NULL;
+ ws = &ap_scoreboard_image->servers[i][j];
+ res = ws->status;
+
+ if (res == SERVER_READY && ps->generation == mpm_generation) {
+ ready++;
+ }
+ else if (res != SERVER_DEAD &&
+ res != SERVER_STARTING && res != SERVER_IDLE_KILL &&
+ ps->generation == mpm_generation) {
+ busy++;
+ }
+ }
+ }
+ total = busy + ready;
+ if (total) {
+ ld->idle = ready * 100 / total;
+ ld->busy = busy * 100 / total;
+ }
+
+}

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