Step by Step Trouble Shooting"
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[[File:chrome_developer_tools_network_example_phases.jpg]] | [[File:chrome_developer_tools_network_example_phases.jpg]] | ||
| − | CONNECTING (or one of Proxy, DNS Lookup, Blocking, SSL) | + | '''CONNECTING''' (or one of Proxy, DNS Lookup, Blocking, SSL) |
:'''3.a) Is this a network problem (everything between browser and ZK Application)?''' | :'''3.a) Is this a network problem (everything between browser and ZK Application)?''' | ||
:*test ping / trace route to different servers | :*test ping / trace route to different servers | ||
:*test dns lookup timing | :*test dns lookup timing | ||
:YES → [[#Network Issue]] | :YES → [[#Network Issue]] | ||
| − | :NO → [[#Server Side Issue]] (application | + | :NO → [[#Server Side Issue]] (application takes long time to accept connection, or even times out) |
| − | SENDING | + | |
| + | '''SENDING''' | ||
:'''3.b) Is the request unreasonably big?''' | :'''3.b) Is the request unreasonably big?''' | ||
:YES → [[#Client Side Issue]] | :YES → [[#Client Side Issue]] | ||
| Line 56: | Line 57: | ||
:↓ | :↓ | ||
| − | :'''3.c)Is the bandwidth low?''' | + | :'''3.c) Is the bandwidth low?''' |
:*e.g. try upload the same amount of data to the server via ftp/scp to check possible upload speed | :*e.g. try upload the same amount of data to the server via ftp/scp to check possible upload speed | ||
:YES → [[#Network Issue]] | :YES → [[#Network Issue]] | ||
| − | :NO → [[#Server Side Issue]] (application server receiving slowly) | + | :NO → [[#Server Side Issue]] (application server receiving request data slowly) |
| − | |||
| − | + | '''WAITING''' → [[#Server Side Issue]] (application server taking long time to prepare response) | |
| − | + | ||
| − | + | ||
| − | + | '''RECEIVING''' | |
| − | + | :'''3.d) Is the response unreasonably big?''' | |
| − | + | :YES → check ROD (Render on Demand - settings), compression settings '''TODO config links''' | |
| − | + | :NO | |
| − | + | :↓ | |
| − | + | :'''3.e) Is the bandwidth low?''' | |
| + | :*e.g.try to download the same amount of data from the server via ftp/scp to check download speed | ||
| + | :YES → ask your administrator to fix it ;) | ||
| + | :NO → [[#Server Side Issue]] (appserver sending response data slowly) | ||
==Network Issue== | ==Network Issue== | ||
Revision as of 11:19, 17 September 2013
Performance SOP
Identify the Bottleneck
Usually the bottleneck can be found in one of these areas:
- client
- network
- server
To breakdown a slow performing web application is a good idea to start, where the bad performance is perceived... in the browser. Most modern browsers provide very sophisticated tools to start the search for the bottleneck and draw some conclusions, and exclude other possible causes easily.
- Dev tools (Network)
- Chrome -> [F12]
- Firefox -> [F12] or Firebug
- IE9+ -> [F12]
- IE8 -> fiddler2
File:Chrome developer tools network.jpg
Investigating the network traffic following the questions below the biggest problem area(s) should become apparent after a few minutes:
1. Are there one or more long running requests?
NO → #Client Side Issue
YES
↓
2. Is it a static resource?
YES (js, css, images...) → check #ZK Server Configuration → STILL SLOW → #Network Issue
NO (dynamic request into ZK application)
- *.zul = full page request (can be followed by ajax requests)
- zkau/* = ajax request
↓
3. Which PHASE of the request is slowest ? (examples based on Chrome developer tools)
File:Chrome developer tools network example phases.jpg
CONNECTING (or one of Proxy, DNS Lookup, Blocking, SSL)
- 3.a) Is this a network problem (everything between browser and ZK Application)?
- test ping / trace route to different servers
- test dns lookup timing
- YES → #Network Issue
- NO → #Server Side Issue (application takes long time to accept connection, or even times out)
SENDING
- 3.b) Is the request unreasonably big?
- YES → #Client Side Issue
- NO
- ↓
- 3.c) Is the bandwidth low?
- e.g. try upload the same amount of data to the server via ftp/scp to check possible upload speed
- YES → #Network Issue
- NO → #Server Side Issue (application server receiving request data slowly)
WAITING → #Server Side Issue (application server taking long time to prepare response)
RECEIVING
- 3.d) Is the response unreasonably big?
- YES → check ROD (Render on Demand - settings), compression settings TODO config links
- NO
- ↓
- 3.e) Is the bandwidth low?
- e.g.try to download the same amount of data from the server via ftp/scp to check download speed
- YES → ask your administrator to fix it ;)
- NO → #Server Side Issue (appserver sending response data slowly)
Network Issue
not part of this SOP, ask your network administrator
Server Side Issue
Server Side Profiling
Memory Issue
ZK Server Configuration
- check debug mode → zk config should not be enabled (disabled by default)
- check caching config → should not be disabled (enabled by default)
- http://books.zkoss.org/wiki/ZK_Configuration_Reference/zk.xml/The_Library_Properties/org.zkoss.web.classWebResource.cache
- http://books.zkoss.org/wiki/ZK_Configuration_Reference/zk.xml/The_Library_Properties/org.zkoss.zk.WPD.cache
- http://books.zkoss.org/wiki/ZK_Configuration_Reference/zk.xml/The_Library_Properties/org.zkoss.zk.WCS.cache
- TODO ??? maybe more tweaks ???