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view website/issues/html/user.help-search.html @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | 7146b68ac263 |
| children | 28aa76443f58 |
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<html tal:define="form request/form/form/value; field request/form/property/value" > <head> <title>Search input for user helper</title> <script language="Javascript" type="text/javascript" tal:attributes="nonce request/client/client_nonce" tal:content="structure string:<!-- // this is the name of the field in the original form that we're working on form = parent.opener.document.${form}; field = '${field}'; //-->"> </script> <script type="text/javascript" src="@@file/help_controls.js" tal:attributes="nonce request/client/client_nonce"></script> <link rel="stylesheet" type="text/css" href="@@file/style.css" /> </head> <body onload="parent.submit.url='...'" tal:define=" qs request/env/QUERY_STRING; qs python:'&'.join([a for a in qs.split('&') if not a.startswith('@template=')])" > <pre tal:content="request/env/QUERY_STRING" tal:condition=false /> <form method="get" name="itemSynopsis" target="list" tal:attributes="action request/classname" tal:define=" property request/form/property/value; cols python:request.columns or 'id username address realname roles'.split(); sort_on request/sort | nothing; sort_desc python:sort_on and request.sort[0][0] == '-'; sort_on python:sort_on and request.sort[0][1] or 'lastname'; search_input templates/page/macros/search_input; search_select templates/page/macros/search_select; search_select_roles templates/page/macros/search_select_roles; required python:[]; th_label templates/page/macros/th_label; "> <input type="hidden" name="@template" value="help-list"> <input type="hidden" name="property" value="" tal:attributes="value property"> <input type="hidden" name="form" value="" tal:attributes="value request/form/form/value"> <table> <tr tal:define="name string:username; label string:Username:"> <th metal:use-macro="th_label">Name</th> <td metal:use-macro="search_input"><input type=text></td> </tr> <tr tal:define="name string:roles; onchange string:this.form.submit(); label string:Roles:" > <th metal:use-macro="th_label">role</th> <td metal:use-macro="search_select_roles"> <select> <option value="">jokester</option> </select> </td> </tr> <tr> <td> </td> <td> <input type="hidden" name="@action" value="search"> <input type="submit" value="Search" i18n:attributes="value"> <input type="reset"> <input type="hidden" value="username,realname,organisation,roles" name="properties"> <input type="text" name="@pagesize" id="sp-pagesize" value="25" size="2"> <label for="sp-pagesize" i18n:translate="">Pagesize</label> </td> </tr> </table> </form> <pre tal:content="request" tal:condition=false /> <script type="text/javascript" tal:attributes="nonce request/client/client_nonce"><!-- focus2id('username'); //--></script> </body> </html>