| Yesterday I had a conversation with a performance engineer from a large customer (Marqeta). He had concerns about the TSpace implementation consuming too much CPU. The TSpace is fast, and can perform some 4 Million TPSs on my laptop, so it’s never a concern in a production system, he still was comparing it with a general purpose blocking queue implementation. | |
| His test was flawed, and he liked my explanation, which I want to share, because I think this issue will pop up again and again, from time to time. | |
| ``` | |
| When you test in a simulated environment, all sessions are idle, eagerly waiting for a new entry to process. So when the new entry hits the space, and the out operation performs a notify, all idle sessions wake-up and fight in the synchronized block to obtain that entry. This is unrealistic. If you have a 1000 TPS load, it’s not reasonable that all your 100 sessions are idle. Most of them will be processing the transaction. When they finish the transaction, just a few out of those 100 sessions will “figh |
Values can be passed from one test the following using variables.
As an example, let's say we have a purchase and a reversal, and you want to use the purchase approval code in the reversal message.
Your purchase test would look something like this:
<test file="auth" continue="no"
name="Card ok, account 00.858 auth for $40.00 GOOD">
DATE=new Date();
I hereby claim:
To claim this, I am signing this object:
| #!/bin/bash | |
| sudo service jenkins stop | |
| cd /usr/share/jenkins | |
| sudo mv --force jenkins.war jenkins.war.old | |
| sudo wget https://updates.jenkins-ci.org/latest/jenkins.war | |
| sudo service jenkins start | |
| echo "Jenkins has been successfully updated." |
| The following error shows up when the XCode command line is outdated: | |
| ``` | |
| xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun | |
| ``` | |
| To fix it, just do the following on a Terminal window: | |
| ``` | |
| xcode-select --install |
| <?xml version="1.0" encoding="UTF-8"?> | |
| <profiles version="10"> | |
| <profile name="Spring" version="10"> | |
| <setting id="org.eclipse.jdt.core.formatter.align_type_members_on_columns" value="false"/> | |
| <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression" value="16"/> | |
| <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant" value="16"/> | |
| <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call" value="16"/> | |
| <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_method_invocation" value="16"/> | |
| <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_qualified_allocation_expression" value="16"/> | |
| <setting id="org.eclipse.jdt.core.formatter.alignment_for_assignment" value="0"/> |