Re: [HACKERS] Protocol Message Graph
On Sun, 2006-04-23 at 18:43 -0400, Alvaro Herrera wrote: Agent M wrote: I have created a directed graph using graphviz that shows the message flow/event stream. Perhaps this will be helpful to someone. Of course, corrections are also welcome. Thats a good start. Maybe it would make more sense to have a graph of states, and the edges would indicate what messages are sent to change from one state to another. Yes, that would be better. It would be good to do the same for LWLock states, to help check for deadlock possibilities. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
[HACKERS] Protocol Message Graph
I have created a directed graph using graphviz that shows the message flow/event stream. Perhaps this will be helpful to someone. Of course, corrections are also welcome. http://www.themactionfaction.com/pg/PGXProtocol.dot http://www.themactionfaction.org/pg/PGXProtocol.svg http://www.themactionfaction.org/pg/PGXProtocol.pdf (Messages in ellipses are sent from the server, rectangle message are sent from the client.) -M ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ AgentM [EMAIL PROTECTED] ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ---(end of broadcast)--- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [HACKERS] Protocol Message Graph
Agent M wrote: I have created a directed graph using graphviz that shows the message flow/event stream. Perhaps this will be helpful to someone. Of course, corrections are also welcome. Interesting. I'm not sure how to read the graph however -- for example what does it mean to have ReadyForQuery in both a rectangle and an ellipse? What do the standalone boxes mean? (e.g. the SSLRequest and CancelRequest? and why are they wrapped in two boxes? why Close/CloseComplete appear from nowhere and they don't lead anywhere?) Maybe it would make more sense to have a graph of states, and the edges would indicate what messages are sent to change from one state to another. -- Alvaro Herrerahttp://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] Protocol Message Graph
On Apr 23, 2006, at 6:43 PM, Alvaro Herrera wrote: Agent M wrote: I have created a directed graph using graphviz that shows the message flow/event stream. Perhaps this will be helpful to someone. Of course, corrections are also welcome. Interesting. I'm not sure how to read the graph however -- for example what does it mean to have ReadyForQuery in both a rectangle and an ellipse? What do the standalone boxes mean? (e.g. the SSLRequest and CancelRequest? and why are they wrapped in two boxes? why Close/CloseComplete appear from nowhere and they don't lead anywhere?) Maybe it would make more sense to have a graph of states, and the edges would indicate what messages are sent to change from one state to another. I tried to group the messages by functionality: asynchronous, simple, extended, copy, function, etc. Since ReadyForQuery shows up in multiple modes, I put it in its own mode (hence the additional bounding box). I agree that the graph isn't perfect, but I also ran up against certain limitations in graphiz itself (e.g., only one level of subgraph is supported). So it's useful as a guide, but it clearly isn't a state machine. -M ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ AgentM [EMAIL PROTECTED] ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ¬ ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
