Megatest

	 exn
	 #f
	 (debug:print 2 *default-log-port* "reading file " fullpath)
	 (let ((real-age (- (current-seconds)(file-change-time fullpath)))) 
	   (if (< real-age age)
	       (with-input-from-file fullpath read)
	       (begin
		 (debug:print 2 *default-log-port* "file " fullpath " is too old (" real-age" seconds)to trust, skipping reading it")
		 (debug:print 1 *default-log-port* "file " fullpath " is too old (" real-age" seconds) to trust, skipping reading it")
		 #f))))
	(begin
	  (debug:print 2 *default-log-port* "not reading file " fullpath)
	  #f))))
 
(define (common:write-cached-info key dtype dat)
  (let* ((fulldir  (conc *toppath* "/.sysdata"))

                     #f
                     (common:get-homehost)))
         (hh     (if hh-dat (car hh-dat) #f)))
    (common:wait-for-normalized-load maxload msg hh)))

(define (common:get-num-cpus remote-host)
  (let* ((actual-host (or remote-host (get-host-name))))
    (or (common:get-cached-info actual-host "num-cpus" age: 86400) ;; hosts had better not be changing the number of cpus too often!
    (or (common:get-cached-info actual-host "num-cpus" age: (+ 2592000 (random 3600))) ;; hosts had better not be changing the number of cpus too often!
	(let* ((proc   (lambda ()
			 (let loop ((numcpu 0)
				    (inl    (read-line)))
			   (if (eof-object? inl)
			       (begin
				 (common:write-cached-info actual-host "num-cpus" numcpu)
				 numcpu)