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lmdb: more usefull info from mdb_stat tool.

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Change-Id: I64015952431aebabf792b912acd022a6ddc79903
This commit is contained in:
Leo Yuriev 2014-12-30 00:15:03 +03:00
parent 1b8398b413
commit 7984f8817f
3 changed files with 51 additions and 2 deletions
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1
lmdb.h
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@ -449,6 +449,7 @@ typedef struct MDB_envinfo {
size_t me_mapsize; /**< Size of the data memory map */ size_t me_mapsize; /**< Size of the data memory map */
size_t me_last_pgno; /**< ID of the last used page */ size_t me_last_pgno; /**< ID of the last used page */
size_t me_last_txnid; /**< ID of the last committed transaction */ size_t me_last_txnid; /**< ID of the last committed transaction */
size_t me_tail_txnid; /**< ID of the last reader transaction */
unsigned int me_maxreaders; /**< max reader slots in the environment */ unsigned int me_maxreaders; /**< max reader slots in the environment */
unsigned int me_numreaders; /**< max reader slots used in the environment */ unsigned int me_numreaders; /**< max reader slots used in the environment */
} MDB_envinfo; } MDB_envinfo;

15
mdb.c
View File

@ -9057,6 +9057,21 @@ mdb_env_info(MDB_env *env, MDB_envinfo *arg)
arg->me_last_pgno = env->me_metas[toggle]->mm_last_pg; arg->me_last_pgno = env->me_metas[toggle]->mm_last_pg;
arg->me_last_txnid = env->me_metas[toggle]->mm_txnid; arg->me_last_txnid = env->me_metas[toggle]->mm_txnid;
arg->me_tail_txnid = 0;
if (env->me_txns) {
MDB_reader *r = env->me_txns->mti_readers;
int i;
arg->me_tail_txnid = arg->me_last_txnid;
for (i = arg->me_numreaders; --i >= 0; ) {
if (r[i].mr_pid) {
txnid_t mr = r[i].mr_txnid;
if (arg->me_tail_txnid > mr)
arg->me_tail_txnid = mr;
}
}
}
return MDB_SUCCESS; return MDB_SUCCESS;
} }

33
mdb_stat.c
View File

@ -130,6 +130,8 @@ int main(int argc, char *argv[])
printf(" Max pages: %"Z"u\n", mei.me_mapsize / mst.ms_psize); printf(" Max pages: %"Z"u\n", mei.me_mapsize / mst.ms_psize);
printf(" Number of pages used: %"Z"u\n", mei.me_last_pgno+1); printf(" Number of pages used: %"Z"u\n", mei.me_last_pgno+1);
printf(" Last transaction ID: %"Z"u\n", mei.me_last_txnid); printf(" Last transaction ID: %"Z"u\n", mei.me_last_txnid);
printf(" Tail transaction ID: %"Z"u (%"Z"i)\n",
mei.me_tail_txnid, mei.me_tail_txnid - mei.me_last_txnid);
printf(" Max readers: %u\n", mei.me_maxreaders); printf(" Max readers: %u\n", mei.me_maxreaders);
printf(" Number of readers used: %u\n", mei.me_numreaders); printf(" Number of readers used: %u\n", mei.me_numreaders);
} }
@ -157,6 +159,7 @@ int main(int argc, char *argv[])
MDB_cursor *cursor; MDB_cursor *cursor;
MDB_val key, data; MDB_val key, data;
size_t pages = 0, *iptr; size_t pages = 0, *iptr;
size_t reclaimable = 0;
printf("Freelist Status\n"); printf("Freelist Status\n");
dbi = 0; dbi = 0;
@ -174,6 +177,8 @@ int main(int argc, char *argv[])
while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) { while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
iptr = data.mv_data; iptr = data.mv_data;
pages += *iptr; pages += *iptr;
if (envinfo && mei.me_tail_txnid > *(size_t *)key.mv_data)
reclaimable += *iptr;
if (freinfo > 1) { if (freinfo > 1) {
char *bad = ""; char *bad = "";
size_t pg, prev; size_t pg, prev;
@ -200,7 +205,35 @@ int main(int argc, char *argv[])
} }
} }
mdb_cursor_close(cursor); mdb_cursor_close(cursor);
if (envinfo) {
size_t value = mei.me_mapsize / mst.ms_psize;
double percent = value / 100.0;
printf("Page Allocation Info\n");
printf(" Max pages: %9"Z"u 100%%\n", value);
value = mei.me_last_pgno+1;
printf(" Number of pages used: %"Z"u %.1f%%\n", value, value / percent);
value = mei.me_mapsize / mst.ms_psize - (mei.me_last_pgno+1);
printf(" Remained: %"Z"u %.1f%%\n", value, value / percent);
value = mei.me_last_pgno+1 - pages;
printf(" Used now: %"Z"u %.1f%%\n", value, value / percent);
value = pages;
printf(" Free pages: %"Z"u %.1f%%\n", value, value / percent);
value = pages - reclaimable;
printf(" Reading: %"Z"u %.1f%%\n", value, value / percent);
value = reclaimable;
printf(" Reclaimable: %"Z"u %.1f%%\n", value, value / percent);
value = mei.me_mapsize / mst.ms_psize - (mei.me_last_pgno+1) + reclaimable;
printf(" Available: %"Z"u %.1f%%\n", value, value / percent);
} else
printf(" Free pages: %"Z"u\n", pages); printf(" Free pages: %"Z"u\n", pages);
} }
rc = mdb_open(txn, subname, 0, &dbi); rc = mdb_open(txn, subname, 0, &dbi);