Megatest

(define (set-item-env-vars itemdat)
  (for-each (lambda (item)
	      (debug:print 2 "setenv " (car item) " " (cadr item))
	      (setenv (car item) (cadr item)))
	    itemdat))

(define *last-num-running-tests* 0)
(define *runs:can-run-more-tests-delay* 0)
(define (runs:shrink-can-run-more-tests-delay)
  (set! *runs:can-run-more-tests-delay* (/ *runs:can-run-more-tests-delay* 2)))

(define (runs:can-run-more-tests test-record)
  (thread-sleep! *runs:can-run-more-tests-delay*)
  (let* ((tconfig                 (tests:testqueue-get-testconfig test-record))
	 (jobgroup                (config-lookup tconfig "requirements" "jobgroup"))
	 ;; Heuristic fix. These are getting called too rapidly when jobs are running or stuck
	 ;; so we are going to increment a global delay by 0.1 seconds up to 10 seconds
	 ;; every time runs:can-run-more-tests is called.
	 ;; when a test is launched or other activity occurs divide the delay by 2
	 (num-running             (cdb:remote-run db:get-count-tests-running #f))
	 (num-running-in-jobgroup (cdb:remote-run db:get-count-tests-running-in-jobgroup #f jobgroup))
	 (max-concurrent-jobs     (let ((mcj (config-lookup *configdat* "setup"     "max_concurrent_jobs")))
				    (if (and mcj (string->number mcj))
					(string->number mcj)
					1)))
	 (job-group-limit         (config-lookup *configdat* "jobgroups" jobgroup)))
    (if (and (> (+ num-running num-running-in-jobgroup) 0)
	     (< *runs:can-run-more-tests-delay* 10))
	(begin
	  (set! *runs:can-run-more-tests-delay* (+ *runs:can-run-more-tests-delay* 0.1))
	  (debug:print-info 14 "can-run-more-tests-delay: " *runs:can-run-more-tests-delay*)))
    (if (not (eq? *last-num-running-tests* num-running))
	(begin
	  (debug:print 2 "max-concurrent-jobs: " max-concurrent-jobs ", num-running: " num-running)
	  (set! *last-num-running-tests* num-running)))
    (if (not (eq? 0 *globalexitstatus*))
	(list #f num-running num-running-in-jobgroup max-concurrent-jobs job-group-limit)
	(let ((can-not-run-more (cond

		 ( ;; (and
		  (not (hash-table-ref/default test-registery (runs:make-full-test-name test-name item-path) #f))
		      ;; (and max-concurrent-jobs (> (- max-concurrent-jobs num-running) 5)))
		  (debug:print-info 4 "Pre-registering test " test-name "/" item-path " to create placeholder" )
		  (open-run-close db:tests-register-test #f run-id test-name item-path)
		  (hash-table-set! test-registery (runs:make-full-test-name test-name item-path) #t)
		  (thread-sleep! *global-delta*)
(runs:shrink-can-run-more-tests-delay)
		  (loop (car newtal)(cdr newtal) reruns))
		 ((not have-resources) ;; simply try again after waiting a second
		  (debug:print-info 1 "no resources to run new tests, waiting ...")
		  (thread-sleep! (+ 2 *global-delta*))
		  ;; could have done hed tal here but doing car/cdr of newtal to rotate tests
		  (loop (car newtal)(cdr newtal) reruns))
		 ((and have-resources
		       (or (null? prereqs-not-met)
			   (and (eq? testmode 'toplevel)
				(null? non-completed))))
		  (run:test run-id runname keyvallst test-record flags #f)
(runs:shrink-can-run-more-tests-delay)
		  (thread-sleep! *global-delta*)
		  (if (not (null? tal))
		      (loop (car tal)(cdr tal) reruns)))
		 (else ;; must be we have unmet prerequisites
		    (debug:print 4 "FAILS: " fails)
		    ;; If one or more of the prereqs-not-met are FAIL then we can issue
		    ;; a message and drop hed from the items to be processed.
		    (if (null? fails)
			(begin
			  ;; couldn't run, take a breather
			  (debug:print-info 4 "Shouldn't really get here, race condition? Unable to launch more tests at this moment, killing time ...")
			  (thread-sleep! (+ 0.01 *global-delta*)) ;; long sleep here - no resources, may as well be patient
			  ;; we made new tal by sticking hed at the back of the list
			  (loop (car newtal)(cdr newtal) reruns))
			;; the waiton is FAIL so no point in trying to run hed ever again
			(if (not (null? tal))
			    (if (vector? hed)
				(begin (debug:print 1 "WARN: Dropping test " (db:test-get-testname hed) "/" (db:test-get-item-path hed)
						    " from the launch list as it has prerequistes that are FAIL")
(runs:shrink-can-run-more-tests-delay)
				       (thread-sleep! *global-delta*)
				       (loop (car tal)(cdr tal) (cons hed reruns)))
				(begin
				  (debug:print 1 "WARN: Test not processed correctly. Could be a race condition in your test implementation? " hed) ;;  " as it has prerequistes that are FAIL. (NOTE: hed is not a vector)")
(runs:shrink-can-run-more-tests-delay)
				  (thread-sleep! (+ 0.01 *global-delta*))
				  (loop hed tal reruns))))))))) ;; END OF INNER COND
	     
	     ;; case where an items came in as a list been processed
	     ((and (list? items)     ;; thus we know our items are already calculated
		   (not   itemdat)) ;; and not yet expanded into the list of things to be done
	      (if (and (debug:debug-mode 1) ;; (>= *verbosity* 1)