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Run SBCL on DreamHost

If you download a SBCL from, unpacked it, and run it on DreamHost, It issues :

mmap: wanted 1044480 bytes at 0x1000000, actually mapped at 0xe4a3c000
ensure_space: failed to validate 1044480 bytes at 0x01000000
(hint: Try "ulimit -a"; maybe you should increase memory limits.)

That's because on DreamHost the mmap(2) can not return a memory-addr which you wanted without the flag MAP_FIXED, I modified and compiled a x86 version for dreamhost, you can get it here:

Download the zip file from the link above, unzip it to /path/to/sbcl, then you can run it use this command:

SBCL_HOME=/path/to/sbcl/lib/sbcl /path/to/sbcl/bin/sbcl

Like this:

[hoffa]$ SBCL_HOME=/path/to/sbcl/lib/sbcl /path/to/sbcl/bin/sbcl 
This is SBCL 1.0.45, an implementation of ANSI Common Lisp.
More information about SBCL is available at <>.

SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and COPYING files in the
distribution for more information.

And you can puts these ENV-SETTINGS to your ~/.bashrc and ~/.bash_profile

export SBCL_HOME=/path/to/sbcl/lib/sbcl
export PATH=/path/to/sbcl/bin:$PATH

raw patch

(I don't know how kdr2 patched SBCL, but the following seems to work when applied to 43a52658.)

diff --git a/src/runtime/linux-os.c b/src/runtime/linux-os.c
index e262f41..f2d8c9d 100644
--- a/src/runtime/linux-os.c
+++ b/src/runtime/linux-os.c
@@ -314,6 +314,10 @@ os_validate(os_vm_address_t addr, os_vm_size_t len)
     os_vm_address_t actual;
+    // removed in a3b0216 due to some concern of overmapping reserved space
+    if(addr)
+      flags|=MAP_FIXED;
     if (!addr) {

Pass --dynamic-space-size=200 to when building SBCL. Or pass "--dynamic-space-size 130" when starting SBCL. Otherwise it will blow a soft virtual memory limit and the server will kill your process. (Dreamhost may allow larger values. If the values are too small, your program will run out of heap memory.)

⁂ Since compiling SBCL requires an existing Lisp compiler on the machine, how do you do this?

> Answer: You can compile it on another Linux box, not on dreamhost server, then upload it onto yout dreamhost server.

Run FastCGI WebApp Base on SBCL

After you can run SBCL on your DreamHost, you need get sb-fastcgi to build a fastcgi webapp using Common Lisp with SBCL.

get sb-fastcgi asdf-package and install it

Do not know how to install a asdf-package? see the ASDF DOC please.

(Also available using QuickLisp)

write a fcgi-app using sb-fastcgi

This is a example from sb-fastcgi/test.lisp


(asdf:operate 'asdf:load-op 'sb-fastcgi)
(sb-fastcgi:load-libfcgi "/path/to/sb-fastcgi/c_src/")

(defun simple-app (req)
  (let ((c (format nil "Content-Type: text/plain

Hello, I am a fcgi-program using Common-Lisp")))
    (sb-fastcgi:fcgx-puts req c)))

(defun serve ()
  (sb-fastcgi:simple-server #'simple-app))

(defun make-exe (&optional (name "sbcl.fcgi"))
  (sb-ext:save-lisp-and-die name
                            :executable t
                            :purify t
                            :toplevel (lambda ()
                                        (unwind-protect (serve)

Then you can run command:

sbcl --script app.lisp

to generate a executable-file named "sbcl.fcgi". Move the file sbcl.fcgi to your webdir, then change the content of the file .htaccess under the webdir to:

AddHandler fastcgi-script .fcgi
Options +FollowSymLinks +ExecCGI

RewriteEngine On
RewriteRule ^sbcl\.fcgi/ - [L]
RewriteRule ^(.*)$ sbcl.fcgi [L]

Now, You can visit your site to run the app.