Date: Fri, 30 Dec 2011 16:04:08 -0600
From: xiuquan.w...@gmail.com
To: r-help@r-project.org
Subject: [R] HELP!! - PHP calling R to execute a r-code file (*.r)
Hi,
I have met a tough problem when using PHP to call R to generate some plots.
I tested it okay in my personal computer with WinXP. But when I was trying
to update to my server (Win2003 server), I found it did not work. Below is
the details:
I've run into lots of problems like this. Generally first check the php error
log file, I have noidea where it is on your machine, and see if you can get
your script to dump output somewhere,possibly with absolute path so you know
where to look for it LOL. Often the change in user creates unexpected problems
with file permissions and libraries and paths. You need to checkthe specific
direcories for permissions not just top level.
I would also point out that there is Rapache available as well as
Rserver. Curious if people are using R with any other unique situations server
side. We have a java webserver which I use to invoke R via bash scripts and
generate rathercomplicated files. These could take very long to generate but if
you have flexible caching system,it can be easy to re use output files or even
generate them ahead of time. Starting R or any otherprocess is not
instantaneous and often image generation is quite time consuming. Thereare a
lot of issues making it work well in a server setting in real time. Scale
up has also been an issue. Apache threading or process model is quite expensive
if you careabout performance. We were able to use netty front end and so far
that has worked very well.PHP AFAIK is not thread safe however.
1 r-code file (E:/mycode.r):
--
jpeg(E:/mytest.jpg)
plot(1:10)
dev.off()
--
2 php code:
---
exec(R CMD BATCH --vanilla --slave --no-timing E:/mycode.r exit);
---
3 results:
for WinXP: the image can be generated successfully.
for Server(win2003): can not be generated.
BTW, I have added a user everyone with full control permission to the E
disk.
[[elided Hotmail spam]]
Thanks.
All the best,
Xiuquan Wang
[[alternative HTML version deleted]]
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