Just noticed, after digging around in the DB logs from my MQTT instrumentation, that the last spike correlated with a jump in data transferred out of the network interface:
Typical values are much less (see below), so this would seem to validate the "rouge bots hypothesis", currently leading the candidate to explain these periodic spikes:
This is also the first "hard correlation" of a spike with network interface iostats, so, let's see if my code in the post before this one will trap the next big spike
we have an unix system which has
load average normally about 20.
but while i am running a particular unix batch which performs heavy
operations on filesystem and database average load
reduces to 15.
how can we explain this situation?
while running that batch idle cpu time is about %60-65... (0 Replies)
Hello all, I have a question about load averages.
I've read the man pages for the uptime and w command for two or three different flavors of Unix (Red Hat, Tru64, Solaris). All of them agree that in the output of the 2 aforementioned commands, you are given the load average for the box, but... (3 Replies)
Hello, Here is the output of top command. My understanding here is,
the load average 0.03 in last 1 min, 0.02 is in last 5 min, 0.00 is in last 15 min.
By seeing this load average, When can we say that, the system load averge is too high?
When can we say that, load average is medium/low??... (8 Replies)
Hi,
i have installed solaris 10 on t-5120 sparc enterprise.
I am little surprised to see load average of 2 or around on this OS.
when checked with ps command following process is using highest CPU. looks like it is running for long time and does not want to stop, but I do not know... (5 Replies)
Hello AlL,..
I want from experts to help me as my load average is increased and i dont know where is the problem !!
this is my top result :
root@a4s # top
top - 11:30:38 up 40 min, 1 user, load average: 3.06, 2.49, 4.66
Mem: 8168788k total, 2889596k used, 5279192k free, 47792k... (3 Replies)
Hi ,
I am using 48 CPU sunOS server at my work.
The application has facility to check the current load average before starting a new process to control the load.
Right now it is configured as 48. So it does mean that each CPU can take maximum one proces and no processe is waiting.
... (2 Replies)
Hi,
I am getting a high load average, around 7, once an hour. It last for about 4 minutes and makes things fairly unusable for this time.
How do I find out what is using this. Looking at top the only thing running at the time is md5sum.
I have looked at the crontab and there is nothing... (10 Replies)
Here we go....
Preface:
..... so in a galaxy far, far, far away from commercial, data sharing corporations.....
For this project, I used the ESP-WROOM-32 as an MQTT (publish / subscribe) client which receives Linux server "load averages" as messages published as MQTT pub/sub messages.... (6 Replies)
Discussion started by: Neo
6 Replies
LEARN ABOUT PHP
sqlite_open
SQLITE_OPEN(3)SQLITE_OPEN(3)sqlite_open - Opens an SQLite database and create the database if it does not existSYNOPSIS
resource sqlite_open (string $filename, [int $mode = 0666], [string &$error_message])
DESCRIPTION
Object oriented style (constructor): SQLiteDatabase::__construct (string $filename, [int $mode = 0666], [string &$error_message])
Opens an SQLite database or creates the database if it does not exist.
PARAMETERS
o $filename
- The filename of the SQLite database. If the file does not exist, SQLite will attempt to create it. PHP must have write permis-
sions to the file if data is inserted, the database schema is modified or to create the database if it does not exist.
o $mode
- The mode of the file. Intended to be used to open the database in read-only mode. Presently, this parameter is ignored by the
sqlite library. The default value for mode is the octal value 0666 and this is the recommended value.
o $error_message
- Passed by reference and is set to hold a descriptive error message explaining why the database could not be opened if there was
an error.
RETURN VALUES
Returns a resource (database handle) on success, FALSE on error.
EXAMPLES
Example #1
sqlite_open(3) example
<?php
if ($db = sqlite_open('mysqlitedb', 0666, $sqliteerror)) {
sqlite_query($db, 'CREATE TABLE foo (bar varchar(10))');
sqlite_query($db, "INSERT INTO foo VALUES ('fnord')");
$result = sqlite_query($db, 'select bar from foo');
var_dump(sqlite_fetch_array($result));
} else {
die($sqliteerror);
}
?>
NOTES
Tip
On Unix platforms, SQLite is sensitive to scripts that use the fork() system call. If you do have such a script, it is recommended
that you close the handle prior to forking and then re-open it in the child and/or parent. For more information on this issue, see
The C language interface to the SQLite library in the section entitled Multi-Threading And SQLite.
Tip
It is not recommended to work with SQLite databases mounted on NFS partitions. Since NFS is notoriously bad when it comes to lock-
ing you may find that you cannot even open the database at all, and if it succeeds, the locking behaviour may be undefined.
Note
Starting with SQLite library version 2.8.2, you can specify :memory: as the $filename to create a database that lives only in the
memory of the computer. This is useful mostly for temporary processing, as the in-memory database will be destroyed when the process
ends. It can also be useful when coupled with the ATTACH DATABASE SQL statement to load other databases and move and query data
between them.
Note
SQLite is safe mode and open_basedir aware.
SEE ALSO sqlite_popen(3), sqlite_close(3), sqlite_factory(3).
PHP Documentation Group SQLITE_OPEN(3)