Dogelog Player is our recent Prolog system
pet project. Concerning its Java version it has
roots going back into the 1990’s. We provide a
little reflection on some of the milestones
in the past and the current state of the dynamic
database compared to other Prolog systems.

Starting with the synchronized Java Hashtable,
we went to lockless Hashtable, to scrambled
Hashtable and now to hybrid Hashtable. Benchmarking
assertz/1 and retractall/1 on Fibonacci
memoization shows that upcoming Dogelog Player
for Java plays midfield.

See also:

30 Years of Prolog Dynamic Database https://twitter.com/dogelogch/status/1744305938004140342

30 Years of Prolog Dynamic Database
https://www.facebook.com/groups/dogelog

Mild Shock schrieb:

Dogelog Player is a Prolog system for the
JavaScript, Python and Java target platform.
Inside the browser the library(markup) offers
XSS injection safe markup generation. We extended
the library(markup) towards a heap friendly XML
streaming on all target platforms.

Conceptually we were inspired by Java’s class
FilterWriter. Text payload is automatically XML
escaped and tags are written in that the underlying
writer is directly called. As a test case we wrote
a colorizer in 100% Prolog, so that we can phase
out our old Java code.

See also:

XML Streaming for Dogelog Player https://twitter.com/dogelogch/status/1736864678616207768

XML Streaming for Dogelog Player
https://www.facebook.com/groups/dogelog

Mild Shock schrieb:

Dear All,

We are happy to announce a new
edition of the Dogelog player:

- Multi Measurement:
ÿÿ The library(runner) was enhanced to be
able to perform multiple measurements when
used as a benchmark harness. This feature
can for example be used to measure execution
time and garbage collection time, provided
the Prolog system offers such a statistics/2 key.

- JDK 21 Bytecode:
ÿÿ Like we were phasing out formerly Jekejeke
Prolog we are currently also phasing out
JDK 8 Bytecode. There is a grace period
but the transition to JDK 21 Bytecode is
already seen in the new artefacts index9.zip
and dogelog9.zip for the Dogelog Player
on the Java platform.

- Generational GC:
ÿÿ The garbage collector of Dogelog Player
was enhanced to have a more refined triggering
and to also use a faster generational variant
when appropriate. This was implemented for
all target platforms and we see performance
gains Java 42%, JavaScript 51% and Python 61%.

Have Fun!
Jan Burse, 30.11.2023, http://www.xlog.ch/

--- MBSE BBS v1.0.8.4 (Linux-x86_64)
* Origin: ---:- FTN<->UseNet Gate -:--- (3:633/280.2@fidonet)

Dogelog Player is a 100% Prolog written Prolog
interpreter. We started seeding the implementation
of a common HTTP Server library for all targets
JavaScript, Python and Java. Lets take a snapshot of
the current API and report some performance experience.

We could complete a minimal library(spin) and
demonstrate the correct UTF-8 HTTP streaming of a
text stream. We then measured the local delivery of
a hobbit.txt file of 50'000 bytes, we also run
against SWI-Prolog. We were positively surprised by
the performance of JavaScript, Java and SWI-Prolog.
Only the Python performance was a little disappointing.

See also:

Streaming HTTP for Dogelog Player https://twitter.com/dogelogch/status/1748477496364818517

Streaming HTTP for Dogelog Player
https://www.facebook.com/groups/dogelog

--- MBSE BBS v1.0.8.4 (Linux-x86_64)
* Origin: ---:- FTN<->UseNet Gate -:--- (3:633/280.2@fidonet)

Our initial testing with CPython was consistently
very disappointing, so that we switched to PyPy,
the alternative JIT-ing implementation of Python.
With running Doglog Player via PyPy it becomes
comparable in performance to the JavaScript target,
both targets now only lack by ca 50% behind the
Java target and SWI-Prolog.

See also:

Streaming HTTP for Dogelog Player [corrected] https://twitter.com/dogelogch/status/1748646455999332354

Streaming HTTP for Dogelog Player [corrected] https://www.facebook.com/groups/dogelog

ild Shock schrieb:

Dogelog Player is a 100% Prolog written Prolog
interpreter. We started seeding the implementation
of a common HTTP Server library for all targets
JavaScript, Python and Java. Lets take a snapshot of
the current API and report some performance experience.

We could complete a minimal library(spin) and
demonstrate the correct UTF-8 HTTP streaming of a
text stream. We then measured the local delivery of
a hobbit.txt file of 50'000 bytes, we also run
against SWI-Prolog. We were positively surprised by
the performance of JavaScript, Java and SWI-Prolog.
Only the Python performance was a little disappointing.

See also:

Streaming HTTP for Dogelog Player https://twitter.com/dogelogch/status/1748477496364818517

Streaming HTTP for Dogelog Player
https://www.facebook.com/groups/dogelog

--- MBSE BBS v1.0.8.4 (Linux-x86_64)
* Origin: ---:- FTN<->UseNet Gate -:--- (3:633/280.2@fidonet)