overload

A program simulating a single actor, Receiver, being overloaded with messages from Senders. The Pony backpressure system prevents runaway memory growth by preventing Senders from being scheduled until the Receiver is no longer overloaded.

How to Compile

With a minimal Pony installation, in the same directory as this README file run ponyc. You should see content building the necessary packages, which ends with:

...
Generating
 Reachability
 Selector painting
 Data prototypes
 Data types
 Function prototypes
 Functions
 Descriptors
Optimising
Writing ./overload.o
Linking ./overload

How to Run

Once overload has been compiled, in the same directory as this README file run ./overload. You should see a report of the number of senders, the single receiver starting, then messages about the number of messages received in a given timeframe. (This program will loop infinitely so you will need to force it to step.)

$ ./overload
Starting 10000 senders.
Single receiver started.
50000000 messages received in 10761731202 nanos.
100000000 messages received in 12065642226 nanos.
150000000 messages received in 13481541604 nanos.
...

Program Modifications

Modify the program to allow providing the number of senders at the commandline interface.

$ ./overload 2000000
Starting 2000000 senders.
Single receiver started.
50000000 messages received in 9110934011 nanos.
100000000 messages received in 9233131150 nanos.
150000000 messages received in 9110256111 nanos.
...