Aivars Kalvāns articles - 39 total
Making sense of card range query EXPLAIN plans
I was listening to a talk about finding a PAN in a haystack and this slide came up with performance...
The COST of double-entry accounting
Sometimes I think the most important paper of our times is Scalability! But at what COST?We build...
bpftrace username and the openat system call
Once again I am playing with eBPF and bpftrace. This time I am trying to trace all file access....
The O of SOLID
Wikipedia says that O stands for: | Open–closed principle: “Software entities … should be open for...
The S of SOLID
So many people throw SOLID around as the unquestionable truth that I decided to dig a bit deeper and...
Listing SystemV IPC queues
The correct way to list the queues on the Linux machine is by using the ipcs -q command. However, I...
Monitoring Oracle Tuxedo with Linux eBPF
I have built several scripts for monitoring Oracle Tuxedo over the years. Most relied on the tmtrace...
Optimizing Python application's Docker image with strip
I was going through some Docker images of large applications and looking at the layer sizes with...
Accounting systems before TigerBeetle
TigerBeetle is an interesting project to follow. It links to interesting papers, it challenges...
Today I Learned... WTF, Kafka?
I was reading about offset retention and was mentally prepared for losing consumer offsets when the...
Running your pytests faster
Open your conftest.py and type the following lines: import gc # Like gc.disable() but overrides...
How I made `json.dumps` ~20% faster
My journey to understand the performance and concurrency of FastAPI services lead me to the Python...
FastAPI and cooperative multi-threading pt. 2
After finding a good enough solution for FastAPI and cooperative multi-threading issues, a part of me...
Idle HTTP connections in Scala on Kubernetes
Both the HTTP client (Scala) and HTTP server (Python) are running in Kubernetes. Depending on the...
FastAPI and cooperative multi-threading
Cal Paterson wrote a great article comparing and describing synchronous and asynchronous Python...
Optimizing Kafka producers for latency
TL;DR Don’t forget to set socket.nagle.disable=True to disable Nagle’s algorithm The code I am...
Inspecting Python functions
I have a piece of C++ code that calls user-defined functions implemented in Python. Instead of...
The hitchhiker's guide to the tpcall flags
Oracle Tuxedo documentation of the tpcall function describes (mostly) the high-level behavior of the...
Tracing msgrcv with ltrace
ltrace is a tool for tracing dynamic library calls. I use it from time to time and this time I needed...
Fchg32 is the Swiss Army knife of Tuxedo FML32
FML32 is Oracle Tuxedo buffer type similar to std::multimap in C++ or multidict in Python where the...
Debugging Boolean Expressions of Fielded Buffers
I described the SIGFPE bomb of Boolean Expressions before. Going through the list of the C functions...
Making sense of Tuxedo's SCANUNIT, SANITYSCAN, and BLOCKTIME
Time accounting is strange in Oracle Tuxedo. First, there is the SCANUNIT parameter which must be a...
Oracle Tuxedo MSSQ vs. SSSQ
Servers in Oracle Tuxedo can be configured either in Multiple Servers - Single Queue (MSSQ) setup or...
Boolean Expressions of Fielded Buffers
Oracle Tuxedo has the Fboolev32 function for evaluating Boolean expressions in which the “variables”...
Tracking Oracle Tuxedo file transfer
Oracle Tuxedo uses System V IPC message queues for sending messages between processes. These queues...
A Prometheus exporter of Tuxedo metrics
Now that my book about Oracle Tuxedo is completed, I can work on some code that did not make it into...
Oracle Tuxedo queues illustrated
I did investigate tpacall() before and you can find more details there. But this time I had to...
tmshutdown and MSSQ
A server waits for a new incoming service call by using msgrcv() system call on IPC queue. The call...
tpacall(3c) and XA transactions
Oracle Tuxedo allows us to develop transactional service-oriented (or microservice) applications...
Java hates TABs!
Today I Learned one more thing for “tabs versus spaces” debate: Java hates tabs. Turns out Java...