Unless you're unusual and/or a celebrity, the main way to get people reading is to read them first - most of the time, people make friends and read each other in a reciprocal way. So I'd suggest subscribing to anyone who looks interesting, comment on a couple of their entries, give it a day or two and see what happens.

There are a few techie-related communities on Dreamwidth - it looks like you've already found perl, and most of the others are mentioned on dw_community_promo at some point, so have a browse through the tags there.

However, most of the techie posts I've seen have been either Dreamwidth dev-related ones in official communities, or ones on personal journals. For instance, owl works at an IT company, as does afuna, and they both talk about their work occasionally on their journals. I'd suggest subscribing to both of them, or possibly just tracking certain tags for owl, as he/she also posts about other stuff. Other people who do a lot of programming include kareila, zorkian and janinedog, but they don't tend to talk about it as much.

I'd also suggest you post an entry in perl, saying hi and telling people about the Padre community you created.