Performance issues with php:7*-alpine containers using php-gnupg extension

[dlen]

Hi!

We are trying to investigate some performance issues with the php:7-fpm-alpine compared with php:7-fpm image when using php-gnupg extension

Scenarios:

• Docker version 18.02.0-ce, build fc4de447b5

php:7-fpm-alpine container:

• gpg 2.1.20
• gpgme 1.9.0-r0
• php-gnupg: 1.4.0 (Installed through pecl install gnupg and enabled using docker-php-ext-enable gnupg)

php:7-fpm container based on debian:

• gpg 2.1.18
• gpgme 1.8.0-3+b2
• php-gnupg: 1.4.0 (Installed through pecl install gnupg and enabled using docker-php-ext-enable gnupg)

In both scenarios a dummy gpg key with no passphrase was created using gpg --gen-key

The snippet of code used for test is the following:

<?
$body = "THIS IS A TEST";
$gpg = new \gnupg();
$gpg->addsignkey('<GPG_FINGERPRINT>','');
$gpg->setsignmode(\gnupg::SIG_MODE_DETACH);
$signed = $gpg->sign($body);

echo $signed;
?>

The results:

• php:7-fpm-alpine:

time php test.php
real    0m 2.72s
user    0m 0.01s
sys     0m 0.01s

• php:7-fpm:

time php test.php
real    0m0.246s
user    0m0.031s
sys     0m0.042s

Any hint would be appreciated!

[dlen]

Seems like other users are complaining also about alpine performances: gliderlabs/docker-alpine#300

I will close this seems more adecuate to open this issue on the alpine repo.