I know it is something of an obscure corner of everything that Perl can do, but Perl is excellent for "one-liners".

Has anyone developed a module of convenience functions for use with one-liners? I have something in progress but I'd like to see if there is established prior art.

submitted by /u/singe
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Stack:

Nginx FCGI CGI::Fast HTML::Template::Compiled Redis CentOS Linux 7.9 spawn-fcgi 

On process init it does a lot of loading of big hashes and other data into global variables that are mostly preloaded and cached in a distributed Redis install.

To start the application spawn-fcgi creates 6-8 processes on a port nginx then connects to trhough their fcgi module.

The challenge:

— The init process is computing and time consuming; and doing that concurrently six times peaks CPU and overall leads to a ~20-25 second delay before the next web request can be served. And the initial request to each of the six processes has that delay.

I tried loading the content in question directly from Redis on demand but the performance keeping it in memory is naturally much better (minus the initial delay).

is there an architectural pattern that I am not considering here? I am thinking of things as eg. only spinning up one process, having it initialize and then clone(?) it a few times for serving more requests.

I could also think of a way where only 1 process is spawned at a time and once it completes initiation the next one starts; would need to verify that spawn-fcgi can support this.

So my question to this community is if I am missing an obvious better solution than what is in place right now / what I am considering.

Thanks in advance.

submitted by /u/kosaromepr
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I am moving a pile of stuff off of an older Intel Mac Mini onto an M2. Have almost everything migrated, but am stuck on getting a Perl script that relies heavily on DBD::mysql to work. I finally got cpan to build the module, but when I try to use it in actual code, I get: dyld[82852]: missing symbol called. I go through this mess periodically with OS upgrades...and it's possible that this is (once again) OSX ignoring the module because it's not signed. But the given error sounds more like Perl not finding the dynamic library(s) the module was built with...if I just have a script containing "use DBD::mysql;", that doesn't throw an error, which suggests Perl found the module and loaded it. But chokes when it tries to use it.

I'd be fine with building this module with static libraries, if the process of doing so is easy. But have not seen an easy option to cpan to go that route. Suggestions?

submitted by /u/rlmalisz
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Perl Weekly Challenge 272: String Score

https://blogs.perl.org/users/laurent_r/2024/06/perl-weekly-challenge-272-string-score.html

my $result = $some_value / scalar(split(",", $some_array[0])); 

my @ar_foo = ("1", "2", "3"); my $bar = "5"; my $x = $bar / scalar(@ar_foo); 

This week in PSC (150) | 2024-06-06

https://blogs.perl.org/users/psc/2024/06/this-week-in-psc-150-2024-06-06.html

This Week in PSC (147)

https://blogs.perl.org/users/psc/2024/05/this-week-in-psc-147.html

I'm experimenting with different frameworks and I've come across this wonderful catalyst framework based on Perl, does anyone know of a front end (which is website, forums, etc.) coupled with a back end (tracker engine) for use with modern Perl? I have a PHP based one and was wondering if it was possible to do the same using Perl.

submitted by /u/Otherwise-Tune-257
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MariaDB 10 and Perl DBIx::Class::Schema::Loader

https://blogs.perl.org/users/usna78/2024/05/mariadb-10-and-perl-dbixclassschemaloader.html

Perl Weekly Challenge 268: Number Game

https://blogs.perl.org/users/laurent_r/2024/05/perl-weekly-challenge-268-number-game.html

Perl Weekly Challenge 268: Magic Numbers

https://blogs.perl.org/users/laurent_r/2024/05/perl-weekly-challenge-268-magic-numbers.html

Asking for a friend. No really, I don't use VSCode but I know that a lot of people do and in one week I had two different people ask me this. I didn't see anything in the Visual Studio Marketplace. I'm looking for something like markdown-preview enhanced, but for Pod.

If you don't have that, is it something that you would want?

If it's something you want, would you throw in some money to have it? This isn't something I'd do myself, but I know some people with some free time who could use a little money. I could crowdfund it or whatever. The intent is to have something free in the Marketplace.

Would you care if it's not implemented in Perl? If it was JS or whatever VSCode prefers but does the job, that's fine with me (and remember I don't use VSCode). I have no idea how much that matters, but I'd hate for people to have to do all sorts of crazy setup, which for many people is installing anything from CPAN.

submitted by /u/briandfoy
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Perl Toolchain Summit 2024 - Lisbon

https://blogs.perl.org/users/timothy_legge/2024/05/perl-toolchain-summit-2024---lisbon.html

use 5.038; use strictures; use Kavorka qw(fun); use Moops; our %TypeVarRegistry; class MyTypes extends Type::Library :ro { use Type::Library -declare => qw(TypeVar TypeVarExpr); use Types::Common::String qw(NonEmptyStr); use Types::Standard qw(ArrayRef); use Types::Common::Numeric qw(PositiveOrZeroInt); my $TypeVar = Type::Tiny->new( name => 'TypeVar', constraint_generator => fun(NonEmptyStr $name → CodeRef) { fun {} } ); my $TypeVarExpr = Type::Tiny->new( name => 'TypeVarExpr', constraint_generator => fun(NonEmptyStr $name → CodeRef) { fun {} } ); my $SizedArray = Type::Tiny->new( name => 'SizedArray', parent => ArrayRef, constraint_generator => fun( Enum["type"] $literal_type, Type::Tiny $parameterized, Enum["length"] $literal_length, $expr → CodeRef ) { if (PositiveOrZeroInt->check($expr)) { fun { $expr == ArrayRef->of($parameterized)->assert_return($_)->@* } } elsif ('TypeVar' eq $expr->parent->name) { fun { $TypeVarRegistry{$expr->parameters->[0]} = ArrayRef->of($parameterized)->assert_return($_)->@*; 1 } } elsif ('TypeVarExpr' eq $expr->parent->name) { fun { my $eval; # world's worst symbolic expr parser if ( my ($var1, $op, $var2) = $expr->parameters->[0] =~ /(\w+)(\+)(\w+)/ ) { $eval = $TypeVarRegistry{$var1} + $TypeVarRegistry{$var2}; } else { die; } $eval == ArrayRef->of($parameterized)->assert_return($_)->@* } } else { die } }, ); __PACKAGE__->meta->add_type($_) for $TypeVar, $TypeVarExpr, $SizedArray; __PACKAGE__->meta->make_immutable; } use MyTypes qw(SizedArray TypeVar TypeVarExpr); fun add_ok( SizedArray[type => Str, length => TypeVar["m"]] $A, SizedArray[type => Str, length => TypeVar["n"]] $B → SizedArray[type => Str, length => TypeVarExpr["m+n"]] ) { [$A->@*, $B->@*] } use Data::Dx; Dx add_ok([qw(e r t)], [qw(e r t)]); fun add_broken( SizedArray[type => Str, length => TypeVar["m"]] $A, SizedArray[type => Str, length => TypeVar["n"]] $B → SizedArray[type => Str, length => TypeVarExpr["m+n"]] ) { [$A->@*, $B->@*, 'this must not work'] } use Data::Dx; Dx add_broken([qw(a s d f)], [qw(g h j k)]); 

How to install CRISPRCasFinder (for detection of CRISPRs and cas genes)

https://blogs.perl.org/users/glycine/2024/05/how-to-install-crisprcasfinder-for-detection-of-crisprs-and-cas-genes.html

I need to find the distance between two GPS coordinates. Geo::Calc does this effectively, but it hasn't been updated in over a decade, and, more seriously, it adds a significant startup delay just by loading the module:

root@1c8fb16bd7bb:/app# time perl -e 'use v5.38' real 0m0.005s user 0m0.001s sys 0m0.004s root@1c8fb16bd7bb:/app# time perl -e 'use v5.38; use Geo::Calc' real 0m0.679s user 0m0.631s sys 0m0.048s 

submitted by /u/tyrrminal
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The portions of B::Generate associated with PADOP construction use static variables, and thus are not thread safe.

This release imports that section of Generate.xs into sealed.xs and removes the static variable dependencies.

submitted by /u/joesuf4
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Carp::Object, an object-oriented replacement for Carp and Carp::Clan

https://blogs.perl.org/users/dami/2024/05/carpobject-an-object-oriented-replacement-for-carp-and-carpclan.html

The Perl Toolchain Summit 2024

https://blogs.perl.org/users/paul_johnson/2024/05/the-perl-toolchain-summit-2024.html

I am hopeful someone has done this before as I'm stuck... I have a 3TB disk image file and I am trying to find all the different email addresses that I've used over the past 22 years.

I can use hex editor tools to find them but it takes days to look at the data and pick out even a handful of matches.

I use Perl regularly but I normally scan text files and do non binary file actions. That's easy since I can do a line by line search. But binary seems different.

If I want to search for zeropoint@ (no domain because I've used dozens of ISPs over the years and that's why I am trying to figure this out.) inside the entire 3TB file, what's the best way to do that? I can dump the results to a file and then clean it up but the search part has me stuck

Thank you

submitted by /u/zeropointlabs
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Benchmark::DKbench Perl benchmark suite now supports custom benchmarks.

https://blogs.perl.org/users/dimitrios_kechagias/2024/05/benchmarkdkbench-perl-benchmark-suite-now-supports-custom-benchmarks.html

This week in PSC (146) | 2024-05-02

https://blogs.perl.org/users/psc/2024/05/this-week-in-psc-146-2024-05-02.html

Perl Weekly Challenge 267: Line Count

https://blogs.perl.org/users/laurent_r/2024/05/perl-weekly-challenge-267-line-count.html

Perl Toolchain Summit 2024 - Lisbon Portugal

https://blogs.perl.org/users/chad_exodist_granum/2024/05/perl-toolchain-summit-2024---lisbon-portugal.html

LPW 2024 - Call For Papers and Sponsors

https://blogs.perl.org/users/lpw/2024/05/lpw-2024---call-for-papers-and-sponsors.html

Perl Weekly Challenge 267: Product Sign

https://blogs.perl.org/users/laurent_r/2024/05/perl-weekly-challenge-267-product-sign.html

PTS 2024 - Day 4 - here comes the sun... it's all right!

https://blogs.perl.org/users/leo_lapworth/2024/04/pts-2024---day-4---here-comes-the-sun-its-all-right.html

PTS 2024 - day 2 and 3... the bad days

https://blogs.perl.org/users/leo_lapworth/2024/04/pts-2024---day-2-and-3-the-bad-days.html

Although Benchmark::DKbench is a good overall indicator for generic CPU performance for comparing different systems (especially when it comes to Perl software), the best benchmark is always your own code. Hence, the module now lets you incorporate your own custom benchmarks. You can either have them run together with the default benchmarks, or run only your own set, just taking advantage of the framework (reports, multi-threading, monotonic precision timing, configurable repeats with averages/stdev, calculation of thread scaling etc). Here's an example where I run a couple of custom benchmarks on their own with Benchmark::DKbench:

``` use Benchmark::DKbench;

A simplistic benchmark sub:

sub str_bench { for (1..1000) { my $str = join("", map { chr(97 + rand(26)) } 1..rand(15000)); $str =~ s/a/bd/g; $str =~ tr/b/c/; } }

my %stats = suiterun({ include => 'custom', # Run only my custom benchmarks iter => 5, # Iterations to get an average extra_bench => { custom_bench1 => [&str_bench], # Add one more, just inline this time: custom_bench2 => [sub {my @a=split(//, 'x'x$) for 1..5000}], } }); ``` This will produce a report in STDOUT and also return the results in a hash for a single-thread run. You can also run the benchmarks multi-treaded and then calculate & print the multi/single-thread scalability:

```

If you want to get a count of logical cores:

my $cores = system_identity(1);

my %statsmulti = suite_run({ include => 'custom', threads => $cores, iter => 5, extra_bench => { custom_bench1 => [&str_bench], custom_bench2 => [sub {my @a=split(//, 'x'x$) for 1..5000}], } });

my %scal = calc_scalability(\%stats, \%stats_multi); ```

The report prints results per iteration and also aggregates:

``` Aggregates (5 iterations): Benchmark Avg Time (sec) Min Time (sec) Max Time (sec) custom_bench1: 1.092 1.079 1.107 custom_bench2: 0.972 0.961 0.983 Overall Avg Time (sec): 2.065 2.048 2.080

Aggregates (5 iterations, 10 threads): Benchmark Avg Time (sec) Min Time (sec) Max Time (sec) custom_bench1: 1.534 1.464 1.651 custom_bench2: 1.278 1.225 1.345 Overall Avg Time (sec): 2.812 2.689 2.965 The scalability report summarizes as well: Multi thread Scalability: Benchmark Multi perf xSingle Multi scalability % custom_bench1: 7.12 71

custom_bench2: 7.61 76

DKbench summary (2 benchmarks, 5 iterations, 10 threads): Single: 2.065s Multi: 2.812s Multi/Single perf: 7.36x (7.12 - 7.61) Multi scalability: 73.6% (71% - 76%) ```

The suite normally uses a scoring system which works better than times, so you can set that up by adding reference times to each benchmark, and you can also make the benchmarks return something (checksum etc) to verify results etc, see POD for more.

submitted by /u/dkech
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From the tprc-general Slack channel, Todd Rinaldo wrote yesterday that "Talk Accept, Decline, Waitlist emails have been sent out." See tprc.us for more information about this year's Perl and Raku Conference in Las Vegas, NV.

submitted by /u/talexbatreddit
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Mo utilities for email.

Changes for 0.02 - 2024-04-26T23:02:53+02:00

• Add tests for error parameters.
• Rewrite the tests so that the functional tests are first and then the errors.