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From Jörg Schaible <Joerg.Schai...@Elsag-Solutions.com>
Subject RE: [vfs] FTP extremely slow compared to SFTP
Date Tue, 11 Dec 2007 08:27:15 GMT
Hi Mark,

Mark Fortner wrote:
> Jörg,
> Do you have any code snippets for these examples?

Well, it is a bit more complex. Some files in the target directory are opened and read again,
but this does not explain the numbers below. The only difference is the initialization of
the FileSystem with a SFTP URL instead of one with FTP. Since SFTP adds overhead on top of
FTP the only conclusion is, that the FTP implementation in use is horrible slow.

- Jörg

> 
> Mark
> 
> On Dec 10, 2007 5:59 AM, Jörg Schaible
> <Joerg.Schaible@elsag-solutions.com>
> wrote:
> 
>> Hi,
>> 
>> can somebody explain the following numbers - especially why FTP is
>> that dead slow compared to SFTP handling a lot of files? I measure a
>> simple copy action of a directory containing some few files:
>> 
>> ========================================
>> FTP
>> ========================================
>> * Initial Run
>>  - Exporter.............................................. 8252.0 ms
>> * Single File (25kb) 
>>  - Exporter.............................................. 8021.0 ms
>> * Single File (25000kb) 
>>  - Exporter.............................................. 11437.0 ms
>> * Single File (50000kb) 
>>  - Exporter.............................................. 16043.0 ms
>> * Single Directory (with 10 files of 1kb)
>>  - Exporter.............................................. 47859.0 ms
>> * Single Directory (with 25 files of 1kb)
>>  - Exporter.............................................. 113964.0 ms
>> * Single Directory (with 50 files of 1kb)
>>  - Exporter.............................................. 224312.0 ms
>> 
>> ========================================
>> SFTP
>> ========================================
>> * Initial Run
>>  - Exporter.............................................. 1252.0 ms
>> * Single File (25kb) 
>>  - Exporter.............................................. 921.0 ms *
>> Single File (25000kb) 
>>  - Exporter.............................................. 14952.0 ms
>> * Single File (50000kb) 
>>  - Exporter.............................................. 24885.0 ms
>> * Single Directory (with 10 files of 1kb)
>>  - Exporter.............................................. 601.0 ms
>> * Single Directory (with 25 files of 1kb)
>>  - Exporter.............................................. 922.0 ms
>> * Single Directory (with 50 files of 1kb)
>>  - Exporter.............................................. 1552.0 ms
>> 
>> 
>> Any explanation or - even better - suggestions to improve FTP speed?
>> 
>> - Jörg
>> 
>> 
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