Does your platform have GNU time or strace? Try running clamscan with '/usr/bin/time -v' and/or 'strace -c' and compare the output with that of your Ubuntu host.
I wonder if loading the signature DB is causing excessive page faults on the system without as much memory (time -v will tell you how many page faults there were). Here's an example run from an Ubuntu VM: $ /usr/bin/time -v clamscan requirements.txt requirements.txt: OK ----------- SCAN SUMMARY ----------- Known viruses: 8990282 Engine version: 0.100.0 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 0.00 MB Data read: 0.00 MB (ratio 0.00:1) Time: 62.459 sec (1 m 2 s) Command being timed: "clamscan requirements.txt" User time (seconds): 35.13 System time (seconds): 27.24 Percent of CPU this job got: 99% Elapsed (wall clock) time (h:mm:ss or m:ss): 1:02.54 Average shared text size (kbytes): 0 Average unshared data size (kbytes): 0 Average stack size (kbytes): 0 Average total size (kbytes): 0 Maximum resident set size (kbytes): 1005616 Average resident set size (kbytes): 0 Major (requiring I/O) page faults: 0 Minor (reclaiming a frame) page faults: 251128 Voluntary context switches: 2 Involuntary context switches: 2220 Swaps: 0 File system inputs: 8 File system outputs: 8 Socket messages sent: 0 Socket messages received: 0 Signals delivered: 0 Page size (bytes): 4096 Exit status: 0 -Andrew On Wed, May 29, 2019 at 3:50 AM Narashimman Srinivasan < msriniva...@mvista.com> wrote: > Hi > > In custom target, testing of clamAV (0.101.2) scanning set of > files/folders when RFS is from SD-MMC appears > same time taken (~13 mins) with(~1.8GB)/without swap memory under 1 GB RAM. > On comparison clamAV (0.101.2) with Ubuntu host (6 GB, 64 bits), time > taken is always quicker (~42 secs). > > Following is log where time taken is almost same for scanning single file > or set of files on custom target (1 GB RAM) > running with Linux kernel 4.9, where root file system is from SD-MMC card. > > Please let me know your valuable feedback. > ---------------------------- > clamscan ./ > ./.viminfo: OK > > ----------- SCAN SUMMARY ----------- > Known viruses: 6123265 > Engine version: 0.101.2 > Scanned directories: 1 > Scanned files: 1 > Infected files: 0 > Data scanned: 0.00 MB > Data read: 0.00 MB (ratio 0.00:1) > Time: 774.923 sec (12 m 54 s) > --------------------------------------- > > > clamscan ./* > ./101/clamav-freshclam-0.101.2-r0.2.2.cortexa9hf_neon.rpm: OK > ./101/clamav-0.101.2-r0.2.2.cortexa9hf_neon.rpm: OK > ./101/clamav-libclamav-0.101.2-r0.2.2.cortexa9hf_neon.rpm: OK > ./101-old/clamav-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./101-old/clamav-lic-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./101-old/clamav-libclamav-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./101-old/clamav-freshclam-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./101-old1/clamav-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./101-old1/clamav-libclamav-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./101-old1/clamav-freshclam-0.101-r0.2.cortexa9hf_neon.rpm: OK > ./99/clamav-lic-0.99.2-r0.1.cortexa9hf_neon.rpm: OK > ./99/clamav-libclamav-0.99.2-r0.1.cortexa9hf_neon.rpm: OK > ./99/clamav-freshclam-0.99.2-r0.1.cortexa9hf_neon.rpm: OK > ./99/clamav-0.99.2-r0.1.cortexa9hf_neon.rpm: OK > > ----------- SCAN SUMMARY ----------- > Known viruses: 6123265 > Engine version: 0.101.2 > Scanned directories: 4 > Scanned files: 14 > Infected files: 0 > Data scanned: 7.56 MB > Data read: 3.74 MB (ratio 2.02:1) > Time: 791.395 sec (13 m 11 s) > ----------------------------------------- > Thank & Regards > Manjunatha Srinivasan N > > _______________________________________________ > > clamav-users mailing list > clamav-users@lists.clamav.net > https://lists.clamav.net/mailman/listinfo/clamav-users > > > Help us build a comprehensive ClamAV guide: > https://github.com/vrtadmin/clamav-faq > > http://www.clamav.net/contact.html#ml >
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