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<title>About Memory</title>
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</head>
<body>
<div id='header'>
<h1>
About memory
</h1>
<p>
Measuring memory usage in a multi-process browser
</p>
</div>
<div id='content'>
<h2>
Summary
<div class='help'>
<div>
<p>
Summary of memory used by currently active browsers. For browsers
which use multiple processes, memory reflects aggregate memory
used across all browser processes.
</p>
<p>
For <span jscontent="current_browser_name"></span>, processes used
to to display diagnostics information (such as this
"about:memory") are excluded.
</p>
</div>
</div>
</h2>
<table class='list' id='browserComparison'>
<colgroup>
<col class='name' />
<col class='number' />
<col class='number' />
<col class='number' />
<col class='number' />
<col class='number' />
</colgroup>
<tr class='firstRow doNotFilter'>
<th>
</th>
<th colspan='3'>
Memory
<div class='help'>
<div>
<p>
<strong>Memory</strong>
</p>
<p>
<strong>Private:</strong>
Resident memory size that is not shared with any other
process. This is the best indicator of browser memory
resource usage.
</p>
<p>
<strong>Shared:</strong>
Resident memory size that is currently shared with 2 or more
processes. Note: For browsers using multiple processes, if we
simply added the shared memory of each individual process,
this value would be inflated. Therefore, this value is
computed as an approximate value for shared memory in each of
the browser's processes. Note also that shared memory varies
depending on what other processes are running on the system,
and may be difficult to measure reproducibly.
</p>
<p>
<strong>Total:</strong>
The sum of the private + shared resident memory sizes.
</p>
</div>
</div>
</th>
<th colspan='2'>
Virtual memory
<div class='help'>
<div>
<p>
<strong>Virtual memory</strong>
</p>
<p>
<strong>Private:</strong>
The resident and paged bytes committed for use by only this
process.
</p>
<p>
<strong>Mapped:</strong>
Total bytes allocated by this process that are mapped into the
view of a section, backed by either system pagefile or file
system. This is primarily memory-mapped files.
</p>
</div>
</div>
</th>
</tr>
<tr class='secondRow doNotFilter'>
<th class='name'>
Browser
</th>
<th class='name'>
Private
</th>
<th class='number'>
Shared
</th>
<th class='number'>
Total
</th>
<th class='number'>
Private
</th>
<th class='number'>
Mapped
</th>
</tr>
<tr jsselect="browsers">
<td class='name'>
<div>
<strong jscontent="name"></strong>
<span jscontent="version"></span>
</div>
</td>
<td class='number'>
<span class='th'
jscontent="formatNumber(ws_priv + ws_shareable - ws_shared)">
</span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="formatNumber(ws_shared / processes)">
</span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th'
jscontent="formatNumber(ws_priv + ws_shareable - ws_shared +
(ws_shared / processes))"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="formatNumber(comm_priv)"></span>
<span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="formatNumber(comm_map)"></span>
<span class='k'>k</span>
</td>
</tr>
</table>
<div class=otherbrowsers jsdisplay="browsers.length == 1">
Note: If other browsers (e.g. IE, Firefox, Safari) are running,
I'll show their memory details here.
</div>
<br /><br /><br />
<h2>
Processes
<div class='help'>
<div>
<p>
Details of memory usage for each of
<span jscontent="current_browser_name"></span>'s processes.
</p>
</div>
</div>
</h2>
<table class='list' id='memoryDetails'>
<colgroup>
<col class='pid' />
<col class='name' />
<col class='number' />
<col class='number' />
<col class='number' />
<col class='number' />
<col class='number' />
</colgroup>
<tr class='firstRow doNotFilter'>
<th>
</th>
<th>
</th>
<th colspan='3'>
Memory
</th>
<th colspan='2'>
Virtual memory
</th>
</tr>
<tr class='secondRow doNotFilter'>
<th class='pid'>
PID
</th>
<th class='name'>
Name
</th>
<th class='number'>
Private
</th>
<th class='number'>
Shared
</th>
<th class='number'>
Total
</th>
<th class='number'>
Private
</th>
<th class='number'>
Mapped
</th>
</tr>
<tr jsselect="browzr_data">
<td class='pid'>
<span class='th' jscontent="pid"></span>
</td>
<td class='name'>
<div>
Browser
</div>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_ws_priv', $this.ws_priv +
$this.ws_shareable - $this.ws_shared)" jscontent="ws_priv +
ws_shareable - ws_shared"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="ws_shared"></span>
<span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_ws_tot', $this.ws_priv +
$this.ws_shareable)" jscontent="ws_priv +
ws_shareable"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_comm_priv', $this.comm_priv)"
jscontent="comm_priv"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_comm_map', $this.comm_map)"
jscontent="comm_map"></span><span class='k'>k</span>
</td>
</tr>
<tr jsselect="child_data">
<td class='pid'>
<span class='th' jscontent="pid"></span>
</td>
<td class='name'>
<div jscontent="child_name"></div>
<div jsselect="titles">
<span jscontent="$this"></span><br>
</div>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_ws_priv', $this.ws_priv +
$this.ws_shareable - $this.ws_shared)" jscontent="ws_priv +
ws_shareable - ws_shared"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jscontent="ws_shared"></span><span
class='k'>k</span>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_ws_tot', $this.ws_priv +
$this.ws_shareable)" jscontent="ws_priv +
ws_shareable"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_comm_priv', $this.comm_priv)"
jscontent="comm_priv"></span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' jseval="addToSum('tot_comm_map', $this.comm_map)"
jscontent="comm_map"></span><span class='k'>k</span>
</td>
</tr>
<tr class='total doNotFilter'>
<td class='pid'>
</td>
<td class='name'>
Σ
</td>
<td class='number'>
<span class='th' id="tot_ws_priv">0</span><span class='k'>k</span>
</td>
<td class='number'>
</td>
<td class='number'>
<span class='th' id="tot_ws_tot">0</span><span class='k'>k</span>
</td>
<td class='number'>
<span class='th' id="tot_comm_priv">0</span><span class='k'>k</span>
</td>
<td class='number'>
<div class='help'>
<div>
<p>
This is an approximation. Conceptually, this is the total
amount of in-memory pages for the entire logical
<span jscontent="current_browser_name"></span> application,
without double counting shared pages (e.g. mapped DLLs,
SharedMemory bitmaps, etc.) across the browser and renderers.
</p>
</div>
</div>
<span class='th' id="tot_comm_map">0</span><span class='k'>k</span>
</td>
</tr>
<tr class='noResults'>
<td colspan='99'>
No results found.
</td>
</tr>
</table>
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