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Top Forums UNIX for Advanced & Expert Users Nearly Random, Uncorrelated Server Load Average Spikes Post 303044059 by Neo on Thursday 13th of February 2020 05:36:48 AM
Old 02-13-2020
Quote:
Originally Posted by hicksd8
sar I agree is a good idea. Does the CPU spike coincide with an I/O spike??

In my experience this is likely to be kernel element feature. For example, are you watching the cron process itself because, as you will know, this wakes up periodically (and the regularity varies from kernel to kernel, somewhere between 4 and 24 hours) to integrity check its cron table cache in memory against the crontabs on disk. If there's a lot of cron jobs this process takes a short while.

So question is are you checking the cron process itself and not just cron jobs scheduled to run?

The above is a sheer guess.
Hi Dennis,

Quote:
Does the CPU spike coincide with an I/O spike??
No. I have mentioned this a number of times already, including the first post Smilie . There are no network I/O spikes.

Regarding disk I/O, I have not yet set up any instrumentation to attempt to correlate disk I/O to the spikes.
 

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Mojo::Server(3pm)					User Contributed Perl Documentation					 Mojo::Server(3pm)

NAME
Mojo::Server - HTTP server base class SYNOPSIS
use Mojo::Base 'Mojo::Server'; sub run { my $self = shift; # Get a transaction my $tx = $self->build_tx; # Emit "request" event $self->emit(request => $tx); } DESCRIPTION
Mojo::Server is an abstract HTTP server base class. EVENTS
Mojo::Server can emit the following events. "request" $server->on(request => sub { my ($server, $tx) = @_; ... }); Emitted when a request is ready and needs to be handled. $server->unsubscribe('request'); $server->on(request => sub { my ($server, $tx) = @_; $tx->res->code(200); $tx->res->headers->content_type('text/plain'); $tx->res->body('Hello World!'); $tx->resume; }); ATTRIBUTES
Mojo::Server implements the following attributes. "app" my $app = $server->app; $server = $server->app(MojoSubclass->new); Application this server handles, defaults to a Mojo::HelloWorld object. "app_class" my $app_class = $server->app_class; $server = $server->app_class('MojoSubclass'); Class of the application this server handles, defaults to the value of the "MOJO_APP" environment variable or Mojo::HelloWorld. METHODS
Mojo::Server inherits all methods from Mojo::EventEmitter and implements the following new ones. "new" my $server = Mojo::Server->new; Construct a new Mojo::Server object and subscribe to "request" event with default request handling. "build_tx" my $tx = $server->build_tx; Let application build a transaction. "load_app" my $app = $server->load_app('./myapp.pl'); Load application from script. say Mojo::Server->new->load_app('./myapp.pl')->home; "run" $server->run; Run server. Meant to be overloaded in a subclass. SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojo::Server(3pm)
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