Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
16  3657 
On 2007-08-11 16:10, yu****@sina.com wrote:
Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
Most certainly there is, google is your friend. I believe if you include
the word rope in the search you'll find some. Remember though that all
the benchmarks in the world does not mean shit if they don't measure
what you need, so instead of looking for other peoples benchmarks
perform your own with the code you need to run.
--
Erik Wikström
On Aug 11, 10:19 pm, Erik Wikström <Erik-wikst...@telia. comwrote:
On 2007-08-11 16:10, yu_...@sina.com wrote:
Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
Most certainly there is, google is your friend. I believe if you include
the word rope in the search you'll find some. Remember though that all
the benchmarks in the world does not mean shit if they don't measure
what you need, so instead of looking for other peoples benchmarks
perform your own with the code you need to run.
--
Erik Wikström
Thanks for your reply and suggestion. Actually I myself am prety
convinced to prefer std::string, but it's simply not a common sense of
my colleagues. That's why I'm searching for hard proofs to convince
people. I did googled for some time, but didn't find what I can
directly use. Any way I could write some code to compare functionality
we are interested, just as you have suggested.
Regards,
Kevin
On 2007-08-12 11:35, yu****@sina.com wrote:
On Aug 11, 10:19 pm, Erik Wikström <Erik-wikst...@telia. comwrote:
>On 2007-08-11 16:10, yu_...@sina.com wrote:
Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
Most certainly there is, google is your friend. I believe if you include
the word rope in the search you'll find some. Remember though that all
the benchmarks in the world does not mean shit if they don't measure
what you need, so instead of looking for other peoples benchmarks
perform your own with the code you need to run.
--
Erik Wikström
Thanks for your reply and suggestion. Actually I myself am prety
convinced to prefer std::string, but it's simply not a common sense of
my colleagues. That's why I'm searching for hard proofs to convince
people. I did googled for some time, but didn't find what I can
directly use. Any way I could write some code to compare functionality
we are interested, just as you have suggested.
I might have miss understood you original question a bit, I thought that
you wanted to know which was the best performer for a certain kind of
use (such as really large amounts of strings or really large strings) in
which case there might sometimes be some benefits to using C-strings.
But if you mean usage of std::string vs. C-strings in general then I'm
very hard pressed to come up with any argument in favour of C-strings
but it's quite easy to find arguments for std::string (ease of use, no
risk of overflows, don't have to allocate memory manually etc.). In fact
one very good argument against using C-strings is that most buffer
overflow attacks are caused by improper usage of C-strings, and if
std::string had been used instead the code would have been much simpler
and more safe. As for speed, I'd say that std::string is fast enough for
most usages and if your application is an exception you'd probably know
it due to profiling and benchmarks you've already done.
--
Erik Wikström
<yu****@sina.co mwrote in message
news:11******** **************@ g12g2000prg.goo glegroups.com.. .
Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
In my own testing the overhead of std::string .vs. c-style strings was
measured in microseconds. I.E. very negligable.
"Jim Langston" <ta*******@rock etmail.comwrote in message
news:H_******** *****@newsfe04. lga...
<yu****@sina.co mwrote in message
news:11******** **************@ g12g2000prg.goo glegroups.com.. .
>Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
In my own testing the overhead of std::string .vs. c-style strings was
measured in microseconds. I.E. very negligable.
Wait,not micro, the one that is smaller than nano. Lets see, mili, micro,
nano, ... umm.. dang.
Jim Langston wrote:
"Jim Langston" <ta*******@rock etmail.comwrote in message
news:H_******** *****@newsfe04. lga...
>In my own testing the overhead of std::string .vs. c-style strings
was measured in microseconds. I.E. very negligable.
Wait,not micro, the one that is smaller than nano. Lets see, mili,
micro, nano, ... umm.. dang.
Pico? Atto? Femto?
"Victor Bazarov" <v.********@com Acast.netwrote in message
news:8J******** *************** *******@comcast .com...
Jim Langston wrote:
>"Jim Langston" <ta*******@rock etmail.comwrote in message
news:H_******* ******@newsfe04 .lga...
>>In my own testing the overhead of std::string .vs. c-style strings
was measured in microseconds. I.E. very negligable.
Wait,not micro, the one that is smaller than nano. Lets see, mili,
micro, nano, ... umm.. dang.
Pico? Atto? Femto?
Pico, that's it. It took about 4 pico seconds longer to allocate a
std::string than to use a c-style array in my testing. Negligable for any
application.
On Aug 13, 5:03 am, "Jim Langston" <tazmas...@rock etmail.comwrote :
"Victor Bazarov" <v.Abaza...@com Acast.netwrote in message
news:8J******** *************** *******@comcast .com...
Jim Langston wrote:
"Jim Langston" <tazmas...@rock etmail.comwrote in message
news:H_******* ******@newsfe04 .lga...
In my own testing the overhead of std::string .vs. c-style strings
was measured in microseconds. I.E. very negligable.
Wait,not micro, the one that is smaller than nano. Lets see, mili,
micro, nano, ... umm.. dang.
Pico? Atto? Femto?
Pico, that's it. It took about 4 pico seconds longer to
allocate a std::string than to use a c-style array in my
testing. Negligable for any application.
Picosecond differences are probably less than the resolution of
your measurement system; it would be more accurate to say that
you found no measurable difference. But that still doesn't tell
us anything, because we don't know what you were measuring.
Note too that for any given activity, the implementation of
std::string can make a significant difference. For some things,
the implementation in g++ is significantly faster than that in
VC++, for others, the reverse is true. (G++ uses reference
counting; VC++ deep copy with the small string optimization. If
you don't copy much, and most of your strings are short, VC++
will be faster; if you copy long strings a lot, g++.)
--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34
On Aug 12, 6:58 pm, Erik Wikström <Erik-wikst...@telia. comwrote:
On 2007-08-12 11:35, yu_...@sina.com wrote:
On Aug 11, 10:19 pm, Erik Wikström <Erik-wikst...@telia. comwrote:
On 2007-08-11 16:10, yu_...@sina.com wrote:
Is there any comparison data on perfomance difference between
std::string and c style string? Or maybe if there are source code
which could be used to measuer on different compiler/platform, in a
systematic way?
Most certainly there is, google is your friend. I believe if you include
the word rope in the search you'll find some. Remember though that all
the benchmarks in the world does not mean shit if they don't measure
what you need, so instead of looking for other peoples benchmarks
perform your own with the code you need to run.
--
Erik Wikström
Thanks for your reply and suggestion. Actually I myself am prety
convinced to prefer std::string, but it's simply not a common sense of
my colleagues. That's why I'm searching for hard proofs to convince
people. I did googled for some time, but didn't find what I can
directly use. Any way I could write some code to compare functionality
we are interested, just as you have suggested.
I might have miss understood you original question a bit, I thought that
you wanted to know which was the best performer for a certain kind of
use (such as really large amounts of strings or really large strings) in
which case there might sometimes be some benefits to using C-strings.
But if you mean usage of std::string vs. C-strings in general then I'm
very hard pressed to come up with any argument in favour of C-strings
but it's quite easy to find arguments for std::string (ease of use, no
risk of overflows, don't have to allocate memory manually etc.). In fact
one very good argument against using C-strings is that most buffer
overflow attacks are caused by improper usage of C-strings, and if
std::string had been used instead the code would have been much simpler
and more safe. As for speed, I'd say that std::string is fast enough for
most usages and if your application is an exception you'd probably know
it due to profiling and benchmarks you've already done.
--
Erik Wikström- Hide quoted text -
- Show quoted text -
Actually we are dealing with telecomunicatio n protocols, like SIP and
Diameter. Most contents are now text based, so we are right dealing
with large amount of strings, and sometimes the string can be large
(To about Mega bytes). Most operation on string would be copy, find
and concatecation, very little modify or replace operation.
And std::string haven't been widely used yet, so I can't just change
it overnight. That's why I have to do some work outside our
application, and the analysis should better cover as much operations
on strings of different length. That's not a very simple work to do,
I'm just lazy and wonder if somebody had done that.
Regards,
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