XML schema of 4KB takes 8 seconds to be read

[Alan Cossey]

Hello everyone,,
I have an XML schema file that is read into a dataset using the following
code

ds.ReadXmlSchema(strDataFileSchema)

where ds is the dataset it is going into and strDataFileSchema is the path
for the schema file.

My problem is that it takes 8 seconds to read the thing in. Anyone know why
this might be? I've added the entirety of the file below. It is only 4KB in
size and was created using WriteXMLSchema. The associated data file, at 7KB,
only takes a couple of seconds.

Alan Cossey

<?xml version="1.0" standalone="yes"?>
<xs:schema id="NewDataSet" xmlns=""
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="NewDataSet" msdata:IsDataSet="true"
msdata:Locale="en-GB">
<xs:complexType>
<xs:choice maxOccurs="unbounded">
<xs:element name="Company">
<xs:complexType>
<xs:sequence>
<xs:element name="Company" type="xs:string" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="Task">
<xs:complexType>
<xs:sequence>
<xs:element name="TaskRef" type="xs:int" minOccurs="0" />
<xs:element name="TaskDescription" type="xs:string"
minOccurs="0" />
<xs:element name="Company" type="xs:string" minOccurs="0" />
<xs:element name="OpType" type="xs:string" minOccurs="0" />
<xs:element name="Process" type="xs:string" minOccurs="0" />
<xs:element name="SubProcess" type="xs:string" minOccurs="0"
/>
<xs:element name="Location" type="xs:string" minOccurs="0" />
<xs:element name="SubLocation" type="xs:string" minOccurs="0"
/>
<xs:element name="Existing" type="xs:short" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="OpType">
<xs:complexType>
<xs:sequence>
<xs:element name="OpType" type="xs:string" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="Process">
<xs:complexType>
<xs:sequence>
<xs:element name="Company" type="xs:string" minOccurs="0" />
<xs:element name="Process" type="xs:string" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="SubProcess">
<xs:complexType>
<xs:sequence>
<xs:element name="Company" type="xs:string" minOccurs="0" />
<xs:element name="Process" type="xs:string" minOccurs="0" />
<xs:element name="SubProcess" type="xs:string" minOccurs="0"
/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="Location">
<xs:complexType>
<xs:sequence>
<xs:element name="Company" type="xs:string" minOccurs="0" />
<xs:element name="Location" type="xs:string" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="SubLocation">
<xs:complexType>
<xs:sequence>
<xs:element name="Company" type="xs:string" minOccurs="0" />
<xs:element name="Location" type="xs:string" minOccurs="0" />
<xs:element name="SubLocation" type="xs:string" minOccurs="0"
/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>

 

[Peter Foot [MVP]]

Are you running the latest (Service Pack 2) version of the .NETCF Runtime,
there have been some significant performance improvements in the two service
packs since the original .NETCF release.

Peter

--
Peter Foot
Windows Embedded MVP
www.inthehand.com | www.opennetcf.org

Do have an opinion on the effectiveness of Microsoft Windows Mobile and
Embedded newsgroups? Let us know!
https://www.windowsembeddedeval.com/community/newsgroups

 

[Alan Cossey]

Peter,
Yes I am. I've not seen this sort of slowness before, either before I
applied SP2 or since. I've tried using attributes in the XML as well, but
that makes no noticeable difference. To make matters more interesting, a
similar read in of an XML schema from a separate file of the same size takes
just a couple of seconds.

Alan

 

[Ilya Tumanov [MS]]

Most likely that's because you're measuring the first pass which includes
JITing time.
Before you can load schema, huge schema code needs to be JIT'ed.
That takes few seconds regardless of the schema size.

Best regards,

Ilya

This posting is provided "AS IS" with no warranties, and confers no rights.

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