Design and Development performance considerations

NEW ZEALAND
SHAREPOINT
CONFERENCE
MARCH 16+17 2011

Elaine van Bergen
Design and Development performance considerations

Elaine van BergenArchitect OBS Melbourne
SharePoint MVP
Microsoft Virtual Technical Solutions Professional
Co-organiser of Melbourne’s MOSSIG (Microsoft Office Special Interest Group) and SharePoint Saturday Melbourne
@laneyvb on Twitter
Blog at http://laneyvb.blogspot.com/

Agenda
Developer Dashboard
Caching
Logging
Object Disposal
Querying
Throttling

How to Enable
Object Model
PowerShell
STSADM

MasterPage Placement
<Sharepoint:DeveloperDashboardLauncher
ID="DeveloperDashboardLauncher"
NavigateUrl="javascript:ToggleDeveloperDashboard()"
runat="server"
ImageUrl="/_layouts/images/fgimg.png"
Text="<%$Resources:wss,multipages_launchdevdashalt_text%>"
OffsetX=0
OffsetY=78
Height=16
Width=16 />
<div id="DeveloperDashboard" class="ms-developerdashboard" />
<SharePoint:DeveloperDashboard runat="server" />

SPMonitored Scope
using (SPMonitoredScope monitoredScope = new SPMonitoredScope("Monitor My Code"))
{ LongRunningCall(); }
SPCriticalTraceCounter.AddDataToScope(99, "What happened ?", 15, "Add additional info here");
1 Critical
4 Exception (Watson)
6 Assert
8 Warning
10 Unexpected
15 Monitorable

DEV DASHBOARD
Show you something cool

DevDashVis
http://devdashvis.
codeplex.com

Types of Cache
Output – Generated HTML for future requests
Object – Common objects and query results
BLOB – Commonly requested files put on WFE disk
http://download.microsoft.com/download/7/F/0/7F069D0B-B6BD-4692-868B-E8555BB72445/SharePointServerCachesPerformance.docx

Caching

Output
Stores rendered aspx pages
Enable output cache at site collection
Time to live vs. Check for Changes
Each page uses 2x+32 KB of memory
Highly flexible with Cache Profiles

Profile Options
Perform ACL Check
Enabled
Duration
Check for changes
Vary by custom , http header ,query string ,user rights
Cachability
Safe for authenticated use
Allow writers to view cached content

Profile Options Advanced
Per page layout
Cache profile overrides for host header site collections avavilable for:
varyByHeader
varyByParam
varyByCustom
varyByRights
cacheForEditRights

OBJECT
Used by publishing, content by query web part, navigation, search query box, and metadata navigation
Via code e.g. PortalSiteMapProvider
Draft vs published = PortalSuperUserAccountand PortalSuperReaderAccount

Configuring Output Accounts
Super Reader = web policy read
Super User = web policy full
Not run as system
Dedicated accounts not app pool or login

Cache multiplier
1-10
Visible with edit permissions
11-20 Visible to members of group x
21-30
Visible to everyone
31-40
Visible to everyone
Visible to super-user
Visible to super-reader
Visible to super-reader
Visible to super-user

BLOB
On disk on each WFE
Best for infrequently changed css, js and images or large video
Video is normally buffered from SQL on WFE adding latency, BLOB cache is nearly equivalent of IIS direct
Adds http range support

BLOB
Configured per web application
Extended web app has it’s own blob cache
Long url’s can break blob cache (server relative > 160 characters)
Can affect and be corrupted by IIS recycle if large
Optimised for anonymous

BLOB Cache inVALIDating
Edit, Delete cached file = file removed
Delete file not cached, delete folder, rename/delete list, change permissions, title, description, add/remove content type = all files in list removed
Rename/delete web, add/remove permissions, change inheritance, add/update/delete roles = all files in web removed
Delete site collection = all files in site collection removed
Change user policy at web application = entire cache abandoned

Configuring
<BlobCache location="C:blobCache" path=".(gif|jpg|png|css|js)$" maxSize="10" enabled="false"/>
Max-Age is optional , defaults to 86400 seconds (1 day)
Also tune the IIS app pool startup and shutdown to > 300 seconds

Branding Storage Location
SharePoint Library
User Centric
Blob Cache can help
Different libraries may have varied results for anonymous
_Layouts
Default SharePoint Max Age
Custom Virtual Directory or dedicated web app

Caching Design for Images/CSS and Video
MAX AGE determines when to reload
Authors want it to change asap
Version CSS/Image to ensure reload
For examples Myfile1.1.css

CACHING OBJECTS VIA Code
Consider if object is thread safe
SPWEB is not therefore any item with embedded web like SPSListItemCollection can cause issues
Lock and cache to object such as datatable

private static object _lock = new object();
public void CacheData() {
DataTableoDataTable;
SPListItemCollectionoListItems;
lock(_lock) {
oDataTable= (DataTable)Cache["ListItemCacheName"]; I f(oDataTable== null)
{
oListItems= DoQueryToReturnItems();
oDataTable= oListItems.GetDataTable(); Cache.Add("ListItemCacheName", oDataTable, ..);
}
}
}

CACHE
Show you something cool

Logging

Dispose
It’s complicated !
64 bit helps hide the problem for longer
Not just memory, SPRequest = 1:1 SQL connection
http://blogs.msdn.com/b/rogerla

Do NOT DISPOSe
SPContext.Current.Site
SPContext.Current.Web
SPContext.Site
SPContext.Web
SPControl.GetContextWeb(..)
SPControl.GetContextSite(..)
SPFeatureReceiverProperties.Feature.Parent
SPItemEventProperties.ListItem.Web
SPList.BreakRoleInheritance()
Do not call list.ParentWeb.Dispose()
SPListEventProperties.Web
SPListEventProperties.List.Web
SPSite.RootWeb
Problems may occur when SPContext.Web has equality to the SPContext.Web.. make sure you dispose of SPSite and it will cleanup sub webs automatically
SPSite.LockIssue
SPSite.Owner
SPSite.SecondaryContact
SPWeb.ParentWeb
SPWebEventProperties.Web

SHarePoint 2010 changes
Microsoft.SharePoint.WebControls.SiteAdminsitrationSelector.CurrentItem 2007 must dispose, 2010 don’t
Event Recievers
Properties.OpenWeb() – 2007 dispose of SPWeb
SPItemEventProperties.Web instead and no dispose

Dispose Monitoring
SPDisposeCheck
ULS Logs
Memory Internals
SQL Server Connections

Querying Methods
Search Object model solid performed but delayed data
PortalSitemapProvidor if data is low and relatively static
SPListItemsGetDataTable and SPQuery for list data retrieval
For each is the last option
http://office.microsoft.com/download/afile.aspx?AssetID=AM102377231033

Content Iterator
SPQuery query = new SPQuery(); query.Query= "<Where><Eq><FieldRef Name="MyIndexedField"/><Value Type="Text">FieldValue</Value></Eq></Where>" + ContentIterator.ItemEnumerationOrderByNVPField;
ContentIterator ci = new ContentIterator();ci.MaxItemsPerQuery = 500;
ci.ProcessItemsInList(query,
delegate(SPListItem item)
{
// Work on each item.
},
delegate(SPListItem item, Exception e)
{
// Handle an exception that was thrown while iterating. // Return true so that ContentIteratorrethrows the exception. } );

Throttling Types
List Throttling
Row and Column Throttling
Http Request
Unique Permissions
You can add your own

List Throttling
Any operation that impacts x amount of items is throttled
Default is 5000 items, beware of table locks if you change
Overrides for auditors and administrators only in OM
Machine admin overrides all throttle limits
Happy hour(s)

Common operations THAT ARE throttled
Create, remove, delete an indexed field
Add, Modify indexing on field
Delete list
Save list as template
Sort , Filter by non-indexed field
Delete site
Change field uniqueness
Show totals
Change list relationship state on field
Enable disable attachments

List Throttling with Metadata Nav
Retry Query with different indexed fields
Fallback query for subset of data
Enabled for all lists in the web once metadata navigation feature is enabled
Just via the UI not the OM

List Throttling VIA Code
using (SPSite site = new SPSite (“http://site”))
{
using (SPWeb web = theSite.RootWeb)
{
SPList list = web.Lists[“Listname”];
SPQuery query = new SPQuery();
query.QueryThrottleMode = SPQueryThrottleOption.Override;
//setup query here
SPListItemCollection collection = list.GetItems(query);
//do something with your data here
}

Health Score
Health score is given back as part of the http headers X-SharePointHealthScore
0 is healthiest, 10 is the worst
Office applications such as workspace use adaptive sync based on health score
Consider use if performing high load operations remotely

Health Score

Agenda Recap
Developer Dashboard
Caching
Logging
Object Disposal
Querying
Throttling

Questions ?
@Laneyvbelaine.vanbergen@obs.com.au

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Design and Development performance considerations

by Elaine van Bergen

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