Hi! On Windows 8.1 Update 1 Professional with cygwin 2.4.1 (not the latest, I know, I'll recheck under 2.5.1 later), I am running this command:
dd if=/dev/sdb bs=1M | tee sdb.1TB.test | sha256sum > sdb.1TB.test.sha256 the destination folder in on an external drive (NTFS, more detail below). The CPU usage is about 40% (4 core Intel i5-2320) and the current copying speed is 60 MB/s (measured by signaling USR1 to dd and doubleckecking in the task manager). The weird thing is OS disk cache usage. Task manager show this for RAM usage (16GB physical RAM in system, 16 GB fixed size pagefile - on sdb): In use: 1.7 GB Available: 13.7 GB Cached: 14,3 GB (!) Committed: 2,8/32 GB Paged pool: 277 MB Non-paged pool: 126 MB $ cat /proc/meminfo MemTotal: 16758408 kB MemFree: 14409844 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 16758408 kB LowFree: 14409844 kB SwapTotal: 16777216 kB SwapFree: 16233228 kB perfmon.exe shows about 4% pagefile usage. The symptoms are: - starting programs is slow. Starting explorer.exe takes 2-3 seconds versus instant as normal (C: is a SSD) - after a while if left alone programs get stuck (swapped). For example Firefox. If left alone (unused) for a minute and the I try to click a link or scroll the page, it takes about 10 seconds during which the window title shows "Not responding" A simple copy operation should not occupy so much cache IMO. I post here, as cygwin is involved. Any idea what is going on? Where to look? Some system info: Intel i5-2320 16 GB RAM Intel H61 chipset C: Samsung SSD 830 128GB source drive (sdb) is an internal Hitachi HDS721010CLA332 (1 TB) * Seagate Desktop Expansion 5TB external drive, connected over USB3.0 Regards, David Balažic -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple