Performance comparisons¶

D-LAN vs ApexDC++¶

We measured the transfer time and the number of CPU cycles for one transfer at a time of a 3.2 GiB file. This is a particular case, the performance of both systems may varies in a concurrent downloading and uploading case.

Setup¶

• We used two computers on a gigabit LAN.
• There is a local DC++ hub: ADCH++ 2.8.0.
• We didn't do any other operations during a transfer.
• We download/upload only one file at the same time. We cleared queued and file before each measurement (the file is deleted from the trash).

• OS: Windows 7 64bits
• Download computer CPU: Intel Core 2 Duo E8400, 4 GiB of RAM
• Upload computer CPU: Intel Core i7 860, 6 GiB of RAM
• Apex version: v1.5.2.1276 (64bits)
• D-LAN version: 1.1.0 Beta6

• Software used to count cycles: Process Hacker 2

Download speed¶

We repeated the transfer three times.

	# 1	# 2	# 3	Average	Average download speed
ApexDC++	160 s	167 s	163 s	163.3 s	20.1 MiB/s
D-LAN	78 s	87 s	86 s	83.7 s	39.2 MiB/s

CPU Cycles¶

These values are measured in one download/upload of a 3.2 GiB file.

[Million of cycles]	Download	Upload	Total (less is better)
ApexDC++	199'613	272'655	472'268
D-LAN (Core + GUI)	103'914 (88'800 + 15'114)	24'086 (20'969 + 3'117)	128'000

D-LAN vs DC++ - Downloading a lot of tiny files¶

We measure the time to transfer a directory containing a lot of tiny files. The size of the directory is 2.74 GiB, it contains 3918 directories and 4684 files. Actually this is the directory of the game League Of Legends.

Setup¶

• We used two computers on a gigabit LAN.
• There is a local DC++ hub: ADCH++ 2.8.1.
• We didn't do any other operations during a transfer.
• We did only one transfer at the same time. We cleared queued and the directory before each measurement (the files are deleted from the trash).
• Both output directories are located on the same hard drive.

• OS: Windows 7 64bits
• Download computer CPU: Intel Core i7 860, 6 GiB of RAM
• Upload computer CPU: Intel Core 2 Duo E8400, 4 GiB of RAM
• DC++ version: 0.799 with "download completed" notifications disable
• D-LAN version: 1.1.0 Beta8

Download time¶

We repeated the transfer two times.

	# 1	# 2	Average	Factor
DC++	9min 39s	9min 46s	9min 43s	7.2
D-LAN	1min 20s	1min 22s	1min 21s	1

It seems DC++ has some troubles when there is a lot of little file to transfer.

Remarks¶

DC++ copied the empty files but didn't create the empty directories.