Some questions and Performance issue

Hi all

I'm trying to make an application using berkeley DB.
But I came across a really bad performance (insert 439 / sec) and I also try to go to "DB_QUEUE", but I have a
"size illegal record number" when the power of the record in my db.

# length. / prog 10000
made in 22766,2 ms (updates 439.248/s)

Real 0m22.807s
user 0m0.320s
sys 0m0.580s


And when I call "db-> set_re_len (1024)" and replace "DB_TREE" "DB_QUEUE" (to the db-> open line).
I got this:

illegal record number size
terminate called after throwing an instance of 'DbException.
What(): Db::put: invalid argument
Aborted (core dumped)



Could someone explain to me what I'm doing wrong here?
Thanks a lot for any help

Laurent


Here is the program:


========================================================
#include < db_cxx.h >
#include < sys/time.h >



char buffer [1024];
#define get_timeval (timeval) gettimeofday (& (timeval), 0)
struct timeval start, end;


Sub
usage()
{
std::CERR < < "you should give a number such as ARG1." \n » ;
exit (1);
}


int
main (int argc, char * argv)
{
If (argc! = 2)
usage();
DbEnv * env;
DB * db;
DbSequence * ff.;
DB * dbSeq;
DBT seqKey;
DBT key;
DBT data;

env = new DbEnv (0);
env-> set_flags (DB_AUTO_COMMIT, 1);
env-> set_flags (DB_TXN_WRITE_NOSYNC, 1);

Key.SET_DATA (new db_seq_t);
Key.set_Size (sizeof (db_seq_t));
Data.SET_DATA (new char [1024]);
Data.set_Size (1024);

u_int32_t flags = DB_CREATE
| DB_PRIVATE
| DB_INIT_LOCK
| DB_INIT_LOG
| DB_INIT_TXN
| DB_INIT_MPOOL;
env-> open("/files/lauma/test/PONG",flags,0);

dbSeq = new Db(env,0);
dbSeq-> open(0,"sequences.db",0,DB_BTREE,DB_CREATE,0640);

DB = new Db (env, 0);
DB-> set_pagesize (65536);
DB-> set_re_len (1024);
DB-> open (0, "mytables.db", NULL, DB_BTREE, DB_CREATE, 0640);

SEQ = new DbSequence (dbSeq, 0);
seqKey.set_data (const_cast < char * >("mytables.db"));
seqKey.set_size (strlen ("mytables.db") + 1);
SEQ-> open (0, & key, DB_CREATE);

int count = atoi(argv[1]);
get_timeval (Start);
for (int i = 0; I < Count; ++ I)
{
If ((i % 1000) == 0) std::cout < < I < < 'Save... \n ";
DbTxn * txn;
env-> txn_begin (0, & txn, 0);
dbid db_seq_t;
SEQ-> get (txn, 1, & dbid, 0);
memmove (key.get_data (), & dbid, sizeof (db_seq_t));
memmove (data.get_data (), buffer, 1024);
DB-> put (txn, & keys and data, 0);
TXN-> commit (0);
}
get_timeval (end);
double d = ((end.tv_sec*1000.0 + end.tv_usec/1000.0) - (start.tv_sec * 1000.0 + start.tv_usec/1000.0));
std::cout < < 'fact' < < d < < "ms (" < < (d? ")" (County) * 1000.0 / d): - 1) < < "updates/s)" < < std::endl;

SEQ-> close (0);
dbSeq-> close (0);
DB-> close (0);
env-> close (0);
remove the seq;
Remove dbSeq;
delete db;
Remove env;
}

Hello.

If you are on a little endian machine, you will need to specify a custom key comparison function to ensure that the entire keys are sorted correctly. Without this feature, your random insertions, instead of sequential access, will give you.

The DB-> set_bt_compare to set the comparison function:
http://www.Oracle.com/technology/documentation/Berkeley-DB/DB/api_c/db_set_bt_compare.html

The Getting Started Guide goes further in detail on this subject:
http://www.Oracle.com/technology/documentation/Berkeley-DB/DB/GSG/C/btree.html#comparators

Ben Schmeckpeper

Tags: Database

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    so I used 4 same disks and RAID 10 configuration and performance was even worse.

    I noticed that ESX used the same 1 controller driver since they are compatible. (megaraid sas)

    I want to permanantly unload/remove this driver and let the ESX to use a native without reinstallation of course.

    Any other suggestions to improve performance are welcome.

    Thank you.

    Welcome to the community,

    It is not the driver, what questions it's the writing mode in which operates the RAID controller. RAID controllers usually work in write-through mode, unless they have a cache with battery attached backup module. With the cache with battery backup module, they are able to operate in mode of writeback who basically dope performance. ESX(I) entirely relies on the caching of the RAID controller and does not any software based in implementing caching for security reasons.

    Generally, you will see rates of transfer between 5-20 MB/s in view write-through and > 80 MB / s in write-back mode.

    André

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