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The cache loader performs two tasks: inserting cache objects in inactivity

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list and evaluating total cache size. Reading just directory is enough for
this purpose. Elimination of reading cache files saves at least one disk I/O
operation per file.

Preparation for elimination of reading cache files by cache loader:
removing dependencies on the reading:
*) cache node valid_sec and valid_msec are used only for caching errors;
*) upstream buffer size can be used instead of cache node body_start.
This commit is contained in:
Igor Sysoev 2011-07-24 16:47:31 +00:00
parent bb389f6111
commit c1250b6a49
1 changed files with 6 additions and 11 deletions
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17
src/http/ngx_http_file_cache.c
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@ -533,7 +533,9 @@ ngx_http_file_cache_exists(ngx_http_file_cache_t *cache, ngx_http_cache_t *c)
if (fcn->exists || fcn->uses >= c->min_uses) {
c->exists = fcn->exists;
c->body_start = fcn->body_start;
if (c->body_start) {
c->body_start = fcn->body_start;
}
rc = NGX_OK;
@ -1365,9 +1367,6 @@ ngx_http_file_cache_add_file(ngx_tree_ctx_t *ctx, ngx_str_t *name)
} else {
c.uniq = ngx_file_uniq(&fi);
c.valid_sec = h.valid_sec;
c.valid_msec = h.valid_msec;
c.body_start = h.body_start;
c.length = ngx_file_size(&fi);
c.fs_size = (ngx_file_fs_size(&fi) + cache->bsize - 1) / cache->bsize;
}
@ -1377,10 +1376,6 @@ ngx_http_file_cache_add_file(ngx_tree_ctx_t *ctx, ngx_str_t *name)
ngx_close_file_n " \"%s\" failed", name->data);
}
if (c.body_start == 0) {
return NGX_ERROR;
}
p = &name->data[name->len - 2 * NGX_HTTP_CACHE_KEY_LEN];
for (i = 0; i < NGX_HTTP_CACHE_KEY_LEN; i++) {
@ -1426,14 +1421,14 @@ ngx_http_file_cache_add(ngx_http_file_cache_t *cache, ngx_http_cache_t *c)
fcn->uses = 1;
fcn->count = 0;
fcn->valid_msec = c->valid_msec;
fcn->valid_msec = 0;
fcn->error = 0;
fcn->exists = 1;
fcn->updating = 0;
fcn->deleting = 0;
fcn->uniq = c->uniq;
fcn->valid_sec = c->valid_sec;
fcn->body_start = c->body_start;
fcn->valid_sec = 0;
fcn->body_start = 0;
fcn->fs_size = c->fs_size;
cache->sh->size += c->fs_size;