Memory investigation
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From: "larry on 3 Mar 2010 14:16 That's not really what I'm after. Let me try an example: function foo($id) { static $foos = array(); if (empty($foos[$id]) { $foos[$id] = load_foo($id); } return $foos[$id]; } When load_foo() is slow (e.g., lots of DB traffic or remote-server calls or whatever), such caching can have a significant performance boost. Sometime after foo() has been called 15 times from 30 places in code, when I get to the end of the request (or just every time I call foo() would be fine) I want to be able to do something like: $cost = get_memory_used_by($foos); So that I can determine how much memory that caching is costing me over the lifetime of the page, and determine if it's a worthwhile trade-off. --Larry Garfield dsiembab01(a)gmail.com wrote: > function check_memory_usage(&$memory) > { > $memory[] = memory_get_usage(); > return $memory; > } > > something like this? > you can put it wherever you like and returns an array for further > processing. You could optionally add a second argument to set the index > to a name and check if the name exists to add 1 to the end of the name > so your indexes stay maintained. >
From: Rene Veerman on 3 Mar 2010 14:56 global $fooSize = 0; function foo($id) { ..... global $fooSize; if (empty($foos($id)) { $b = get_memory_usage(true); $foos[$id] = load_foo($id); $fooSize+= $b - get_memory_usage(true); } .... } On Wed, Mar 3, 2010 at 8:16 PM, larry(a)garfieldtech.com <larry(a)garfieldtech.com> wrote: > That's not really what I'm after. Let me try an example: > > function foo($id) { > static $foos = array(); > > if (empty($foos[$id]) { > $foos[$id] = load_foo($id); > } > return $foos[$id]; > } > > When load_foo() is slow (e.g., lots of DB traffic or remote-server calls or > whatever), such caching can have a significant performance boost. Sometime > after foo() has been called 15 times from 30 places in code, when I get to > the end of the request (or just every time I call foo() would be fine) I > want to be able to do something like: > > $cost = get_memory_used_by($foos); > > So that I can determine how much memory that caching is costing me over the > lifetime of the page, and determine if it's a worthwhile trade-off. > > --Larry Garfield > > dsiembab01(a)gmail.com wrote: >> >> function check_memory_usage(&$memory) >> { >> $memory[] = memory_get_usage(); >> return $memory; >> } >> >> something like this? >> you can put it wherever you like and returns an array for further >> processing. You could optionally add a second argument to set the index to a >> name and check if the name exists to add 1 to the end of the name so your >> indexes stay maintained. >> > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >
From: dsiembab01 on 3 Mar 2010 15:29 couple questions Larry is this application composed of classes or straight up no holes barred procedural code? larry(a)garfieldtech.com wrote: > That's not really what I'm after. Let me try an example: > > function foo($id) { > static $foos = array(); > > if (empty($foos[$id]) { > $foos[$id] = load_foo($id); > } > return $foos[$id]; > } > > When load_foo() is slow (e.g., lots of DB traffic or remote-server calls > or whatever), such caching can have a significant performance boost. > Sometime after foo() has been called 15 times from 30 places in code, > when I get to the end of the request (or just every time I call foo() > would be fine) I want to be able to do something like: > > $cost = get_memory_used_by($foos); > > So that I can determine how much memory that caching is costing me over > the lifetime of the page, and determine if it's a worthwhile trade-off. > > --Larry Garfield > > dsiembab01(a)gmail.com wrote: >> function check_memory_usage(&$memory) >> { >> $memory[] = memory_get_usage(); >> return $memory; >> } >> >> something like this? >> you can put it wherever you like and returns an array for further >> processing. You could optionally add a second argument to set the >> index to a name and check if the name exists to add 1 to the end of >> the name so your indexes stay maintained. >>
From: "larry on 3 Mar 2010 15:33 Currently it's mostly procedural with some components that are OO. I suspect most of the memory sinks are large arrays (we have a lot of them), but I am not certain of that. Hence my interest in more accurate investigation tools. --Larry Garfield dsiembab01(a)gmail.com wrote: > couple questions Larry is this application composed of classes or > straight up no holes barred procedural code? > > larry(a)garfieldtech.com wrote: >> That's not really what I'm after. Let me try an example: >> >> function foo($id) { >> static $foos = array(); >> >> if (empty($foos[$id]) { >> $foos[$id] = load_foo($id); >> } >> return $foos[$id]; >> } >> >> When load_foo() is slow (e.g., lots of DB traffic or remote-server >> calls or whatever), such caching can have a significant performance >> boost. Sometime after foo() has been called 15 times from 30 places in >> code, when I get to the end of the request (or just every time I call >> foo() would be fine) I want to be able to do something like: >> >> $cost = get_memory_used_by($foos); >> >> So that I can determine how much memory that caching is costing me >> over the lifetime of the page, and determine if it's a worthwhile >> trade-off. >> >> --Larry Garfield >> >> dsiembab01(a)gmail.com wrote: >>> function check_memory_usage(&$memory) >>> { >>> $memory[] = memory_get_usage(); >>> return $memory; >>> } >>> >>> something like this? >>> you can put it wherever you like and returns an array for further >>> processing. You could optionally add a second argument to set the >>> index to a name and check if the name exists to add 1 to the end of >>> the name so your indexes stay maintained. >>> >
From: dsiembab01 on 4 Mar 2010 10:15
you could read this http://xdebug.org/docs/execution_trace and then parse trace files to get the memory usage create a global to store user functions, I think user function do not populate get_defined_functions(); until the function is called; $t = get_defined_functions(); $userFunctions = $t['user']; $file = xdebug_get_tracefile_name(); parse the file and then create a function to call the said variable. I think you can figure it out. larry(a)garfieldtech.com wrote: > Currently it's mostly procedural with some components that are OO. I > suspect most of the memory sinks are large arrays (we have a lot of > them), but I am not certain of that. Hence my interest in more accurate > investigation tools. > > --Larry Garfield > > dsiembab01(a)gmail.com wrote: >> couple questions Larry is this application composed of classes or >> straight up no holes barred procedural code? >> >> larry(a)garfieldtech.com wrote: >>> That's not really what I'm after. Let me try an example: >>> >>> function foo($id) { >>> static $foos = array(); >>> >>> if (empty($foos[$id]) { >>> $foos[$id] = load_foo($id); >>> } >>> return $foos[$id]; >>> } >>> >>> When load_foo() is slow (e.g., lots of DB traffic or remote-server >>> calls or whatever), such caching can have a significant performance >>> boost. Sometime after foo() has been called 15 times from 30 places >>> in code, when I get to the end of the request (or just every time I >>> call foo() would be fine) I want to be able to do something like: >>> >>> $cost = get_memory_used_by($foos); >>> >>> So that I can determine how much memory that caching is costing me >>> over the lifetime of the page, and determine if it's a worthwhile >>> trade-off. >>> >>> --Larry Garfield >>> >>> dsiembab01(a)gmail.com wrote: >>>> function check_memory_usage(&$memory) >>>> { >>>> $memory[] = memory_get_usage(); >>>> return $memory; >>>> } >>>> >>>> something like this? >>>> you can put it wherever you like and returns an array for further >>>> processing. You could optionally add a second argument to set the >>>> index to a name and check if the name exists to add 1 to the end of >>>> the name so your indexes stay maintained. >>>> >> |