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HipHop clarifications

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Subject:HipHop clarifications
Summary:A few notes on HipHop and JIT in both systems
Author:Sara Golemon
Date:2012-12-10 19:43:09
Update:2012-12-11 05:22:31

  1. HipHop clarifications   Reply   Report abuse  
Picture of Sara Golemon Sara Golemon - 2012-12-10 21:08:30
Hi, just listened to this podcast and I wanted to make a few notes about the comments made about HipHop.

1) Buildling from source: Yes, it's still a bit of a pain, largely due to the fact that we use cutting edge features not found in most linux distro prebuilt packages. In fact, Ubuntu 12.04+ is the only distro we're officially supporting at the moment since others do present a pain point in the build process.

2) Installing prebuilt packages: If you do happen to be on Ubuntu 12.04 or 12.10, you can use and install will take about 3 minutes.

3) Bytecodes and VMs: HHVM's approach of compiling source was described as "very different" from PHP's. That's not entirely accurate. In fact, PHP's runtime *is* a virtual machine, and the intermediate state which HHVM runs *is* bytecode. What differs is A: What kind of bytecode is generated (e.g. dynamic zvals versus static type analysis), and where it's stored (memory versus sqlite db), and B: What happens to that bytecode when it gets used a lot (JITing).

4) Parity: One of my highest goals right now is making HipHop as close to at parity with PHP as possible. Since most of the team is working on making the runtime faster and the compiler leaner, it's nearly a one-person job, so that takes time. Extensions like redis and...I forget off hand which other was referenced... will be supported, it's just a matter of time.

-Sara Golemon
PHP Internals contributor
HipHop OSS coordinator

P.S. - If you'd like to do a followup show, I'd be happy to join the discussion.

  2. Re: HipHop clarifications   Reply   Report abuse  
Picture of Manuel Lemos Manuel Lemos - 2012-12-11 05:22:31 - In reply to message 1 from Sara Golemon
Sara, thank you for your clarifications.

I was not aware that you were part of the HipHop team now and you are working on making HipHop closer to the official PHP implementation. That is excellent news.

We would love to have you on the next podcast to clarify those and other related matters.

We record once every month near the end of the month. If you are available next time, you are on. I will contact you regarding that some time after X-mas.