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rhashtable-test: Measure time to insert, remove & traverse entries 

Make test configurable by allowing to specify all relevant knobs
through module parameters.

Do several test runs and measure the average time it takes to
insert & remove all entries. Note, a deferred resize might still
continue to run in the background.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2015-04-30 22:37:41 +00:00 committed by David S. Miller
parent f54e84b6e9
commit 1aa661f5c3
1 changed files with 69 additions and 31 deletions
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100
lib/test_rhashtable.c
View File

@ -1,14 +1,9 @@
/*
* Resizable, Scalable, Concurrent Hash Table
*
* Copyright (c) 2014 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2014-2015 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
*
* Based on the following paper:
* https://www.usenix.org/legacy/event/atc11/tech/final_files/Triplett.pdf
*
* Code partially derived from nft_hash
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
@ -27,9 +22,28 @@
#include <linux/slab.h>
#define TEST_HT_SIZE 8
#define TEST_ENTRIES 2048
#define TEST_PTR ((void *) 0xdeadbeef)
#define MAX_ENTRIES 1000000
static int entries = 50000;
module_param(entries, int, 0);
MODULE_PARM_DESC(entries, "Number of entries to add (default: 50000)");
static int runs = 4;
module_param(runs, int, 0);
MODULE_PARM_DESC(runs, "Number of test runs per variant (default: 4)");
static int max_size = 65536;
module_param(max_size, int, 0);
MODULE_PARM_DESC(runs, "Maximum table size (default: 65536)");
static bool shrinking = false;
module_param(shrinking, bool, 0);
MODULE_PARM_DESC(shrinking, "Enable automatic shrinking (default: off)");
static int size = 8;
module_param(size, int, 0);
MODULE_PARM_DESC(size, "Initial size hint of table (default: 8)");
struct test_obj {
void *ptr;
@ -37,8 +51,7 @@ struct test_obj {
struct rhash_head node;
};
static const struct rhashtable_params test_rht_params = {
.nelem_hint = TEST_HT_SIZE,
static struct rhashtable_params test_rht_params = {
.head_offset = offsetof(struct test_obj, node),
.key_offset = offsetof(struct test_obj, value),
.key_len = sizeof(int),
@ -50,7 +63,7 @@ static int __init test_rht_lookup(struct rhashtable *ht)
{
unsigned int i;
for (i = 0; i < TEST_ENTRIES * 2; i++) {
for (i = 0; i < entries * 2; i++) {
struct test_obj *obj;
bool expected = !(i % 2);
u32 key = i;
@ -110,26 +123,28 @@ static void test_bucket_stats(struct rhashtable *ht, bool quiet)
}
pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d\n",
total, atomic_read(&ht->nelems), TEST_ENTRIES);
total, atomic_read(&ht->nelems), entries);
if (total != atomic_read(&ht->nelems) || total != TEST_ENTRIES)
if (total != atomic_read(&ht->nelems) || total != entries)
pr_warn("Test failed: Total count mismatch ^^^");
}
static int __init test_rhashtable(struct rhashtable *ht)
static s64 __init test_rhashtable(struct rhashtable *ht)
{
struct bucket_table *tbl;
struct test_obj *obj;
struct rhash_head *pos, *next;
int err;
unsigned int i;
s64 start, end;
/*
* Insertion Test:
* Insert TEST_ENTRIES into table with all keys even numbers
* Insert entries into table with all keys even numbers
*/
pr_info(" Adding %d keys\n", TEST_ENTRIES);
for (i = 0; i < TEST_ENTRIES; i++) {
pr_info(" Adding %d keys\n", entries);
start = ktime_get_ns();
for (i = 0; i < entries; i++) {
struct test_obj *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
@ -157,8 +172,8 @@ static int __init test_rhashtable(struct rhashtable *ht)
test_bucket_stats(ht, true);
rcu_read_unlock();
pr_info(" Deleting %d keys\n", TEST_ENTRIES);
for (i = 0; i < TEST_ENTRIES; i++) {
pr_info(" Deleting %d keys\n", entries);
for (i = 0; i < entries; i++) {
u32 key = i * 2;
obj = rhashtable_lookup_fast(ht, &key, test_rht_params);
@ -168,7 +183,10 @@ static int __init test_rhashtable(struct rhashtable *ht)
kfree(obj);
}
return 0;
end = ktime_get_ns();
pr_info(" Duration of test: %lld ns\n", end - start);
return end - start;
error:
tbl = rht_dereference_rcu(ht->tbl, ht);
@ -183,22 +201,42 @@ static struct rhashtable ht;
static int __init test_rht_init(void)
{
int err;
int i, err;
u64 total_time = 0;
pr_info("Running resizable hashtable tests...\n");
entries = min(entries, MAX_ENTRIES);
err = rhashtable_init(&ht, &test_rht_params);
if (err < 0) {
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
err);
return err;
test_rht_params.automatic_shrinking = shrinking;
test_rht_params.max_size = max_size;
test_rht_params.nelem_hint = size;
pr_info("Running rhashtable test nelem=%d, max_size=%d, shrinking=%d\n",
size, max_size, shrinking);
for (i = 0; i < runs; i++) {
s64 time;
pr_info("Test %02d:\n", i);
err = rhashtable_init(&ht, &test_rht_params);
if (err < 0) {
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
err);
continue;
}
time = test_rhashtable(&ht);
rhashtable_destroy(&ht);
if (time < 0) {
pr_warn("Test failed: return code %lld\n", time);
return -EINVAL;
}
total_time += time;
}
err = test_rhashtable(&ht);
pr_info("Average test time: %llu\n", total_time / runs);
rhashtable_destroy(&ht);
return err;
return 0;
}
static void __exit test_rht_exit(void)