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3 (C) 2004, 2005, 2006, 2007 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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21 * @file datastore/perf_datastore_api.c
22 * @brief performance measurement for the datastore implementation
23 * @author Christian Grothoff
25 * This testcase inserts a bunch of (variable size) data and then deletes
26 * data until the (reported) database size drops below a given threshold.
27 * This is iterated 10 times, with the actual size of the content stored,
28 * the database size reported and the file size on disk being printed for
29 * each iteration. The code also prints a "I" for every 40 blocks
30 * inserted and a "D" for every 40 blocks deleted. The deletion
31 * strategy alternates between "lowest priority" and "earliest expiration".
32 * Priorities and expiration dates are set using a pseudo-random value
33 * within a realistic range.
37 #include "gnunet_util_lib.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_datastore_service.h"
41 static struct GNUNET_DATASTORE_Handle *datastore;
44 * Target datastore size (in bytes).
46 * Example impact of total size on the reported number
47 * of operations (insert and delete) per second (once
48 * roughly stabilized -- this is not "sound" experimental
49 * data but just a rough idea) for a particular machine:
51 * 4: 60 at 7k ops total
52 * 8: 50 at 3k ops total
53 * 16: 48 at 8k ops total
54 * 32: 46 at 8k ops total
55 * 64: 61 at 9k ops total
56 * 128: 89 at 9k ops total
57 * 4092: 11 at 383k ops total (12 GB stored, 14.8 GB DB size on disk, 2.5 GB reported)
59 * Pure insertion performance into an empty DB initially peaks
60 * at about 400 ops. The performance seems to drop especially
61 * once the existing (fragmented) ISAM space is filled up and
62 * the DB needs to grow on disk. This could be explained with
63 * ISAM looking more carefully for defragmentation opportunities.
65 * MySQL disk space overheads (for otherwise unused database when
66 * run with 128 MB target data size; actual size 651 MB, useful
67 * data stored 520 MB) are quite large in the range of 25-30%.
69 * This kind of processing seems to be IO bound (system is roughly
70 * at 90% wait, 10% CPU). This is with MySQL 5.0.
73 #define MAX_SIZE 1024LL * 1024 * 16
76 * Report progress outside of major reports? Should probably be GNUNET_YES if
79 #define REPORT_ID GNUNET_NO
82 * Number of put operations equivalent to 1/10th of MAX_SIZE
84 #define PUT_10 MAX_SIZE / 32 / 1024 / 10
87 * Progress report frequency. 1/10th of a put operation block.
89 #define REP_FREQ PUT_10 / 10
92 * Total number of iterations (each iteration doing
93 * PUT_10 put operations); we report full status every
94 * 10 iterations. Abort with CTRL-C.
96 #define ITERATIONS 100
99 static unsigned long long stored_bytes;
101 static unsigned long long stored_entries;
103 static unsigned long long stored_ops;
105 static struct GNUNET_TIME_Absolute start_time;
111 putValue (int i, int k)
114 static GNUNET_HashCode key;
116 static char data[65536];
118 /* most content is 32k */
120 if (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 16) == 0) /* but some of it is less! */
121 size = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 32 * 1024);
122 size = size - (size & 7); /* always multiple of 8 */
124 GNUNET_CRYPTO_hash (&key, sizeof (GNUNET_HashCode), &key);
125 memset (data, i, size);
127 memset (data, i - 255, size / 2);
129 GNUNET_DATASTORE_put (datastore,
135 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 100),
137 GNUNET_TIME_relative_to_absolute
138 (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
139 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000))),
143 if (ic % REP_FREQ == 0)
144 fprintf (stderr, "I");
146 stored_bytes += size;
154 iterate_delete (void *cls,
155 const GNUNET_HashCode * key,
161 struct GNUNET_TIME_Absolute
162 expiration, uint64_t uid)
164 GNUNET_DATASTORE_remove (datastore, key, size, data, NULL, NULL);
171 struct GNUNET_SCHEDULER_Handle *sched,
173 const char *cfgfile, struct GNUNET_CONFIGURATION_Handle *cfg)
176 unsigned long long size;
179 datastore = GNUNET_DATASTORE_connect (cfg, sched);
180 /* FIXME: change loop to use CPS; current
181 datastore API will likely react negative to
182 us ignoring the callbacks... */
183 for (i = 0; i < ITERATIONS; i++)
186 fprintf (stderr, ".");
188 /* insert data equivalent to 1/10th of MAX_SIZE */
189 for (j = 0; j < PUT_10; j++)
190 GNUNET_assert (GNUNET_OK == putValue (j, i));
192 /* trim down below MAX_SIZE again */
194 GNUNET_DATASTORE_get_random (datastore, &iterate_delete, NULL);
200 "Stored %llu kB / %lluk ops / %llu ops/s\n",
201 stored_bytes / 1024, /* used size in k */
202 (stored_ops * 2 - stored_entries) / 1024, /* total operations (in k) */
203 1000 * (stored_ops * 2 - stored_entries) / (1 + GNUNET_TIME_absolute_get_duration(start_time).value)); /* operations per second */
205 GNUNET_DATASTORE_disconnect (datastore, GNUNET_YES);
213 char *const argv[] = { "perf-datastore-api",
215 "test_datastore_api_data.conf",
221 struct GNUNET_GETOPT_CommandLineOption options[] = {
222 GNUNET_GETOPT_OPTION_END
224 pid = GNUNET_OS_start_process ("gnunet-service-datastore",
225 "gnunet-service-datastore",
229 "-c", "test_datastore_api_data.conf", NULL);
231 GNUNET_PROGRAM_run ((sizeof (argv) / sizeof (char *)) - 1,
232 argv, "perf-datastore-api", "nohelp",
233 options, &run, NULL);
234 if (0 != PLIBC_KILL (pid, SIGTERM))
236 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
239 GNUNET_OS_process_wait(pid);
241 fprintf (stderr, "Missed some testcases: %u\n", ok);
247 main (int argc, char *argv[])
251 GNUNET_log_setup ("perf-datastore-api",
264 /* end of perf_datastore_api.c */