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Tx (LINQ to Logs and Traces)
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Using Tx from LINQPad
is the best way to learn the cutting edge features of C#
In the LINQPad experience of Tx is
as if all the events were in a Database
Except, no database is involved, the query happens directly on raw logs/traces or real-time sessions
with the Tx LINQPad Driver
Queries on trace from HTTP.sys
- the kernel driver used by IIS (Internet Information Services)
Average and Deviation
. This query is based on .blg file (the default output of PerfMon for counters)
- using ETW traces (new in .Net 4.5) to understand errors in WCF client-server application
Cross /provider & cross machine queries
. Response time of IE on client machine and IIS on server.
No Manifest queries
- limited way of using Tx even if you don't have the manifest.
Using Tx from C# code
When to use Tx?
vs. using just LINQ-to-Objects or Rx
: Building console app that does query on ETW trace
: How to generate C# types from Manifests and other schema descriptions
: "Playback" is the API to replay events from one or more file(s)/session(s) in order of occurrence
Features of Playback
: Multiplexed sequences, Heterogeneity, Same API for past & real-time, etc.
Synthetic Performance Counters
: Defining "counters" as queries on events from ETW real-time session (nothing hits disk)
The visual intuition
behind the Playback API
of the Playback
Tx with semi-structured text logs (SharePoint's ULS format).
creation of virtual time from timestamps on the event
Oct 4 at 3:35 AM
, version 32
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