Operating system name and version: Centos 7 x86_64
Version of smsd: Version 3.1.15
Smsd installed from: sources
Name and model of a modem / phone: MTS 423s (Huawei E3531s)
Interface: USB


Good day, could You help me with multi-modem config?
I have server with 4 equal modems (in config are 8 described, but really 4 are inserted). Practically I got aggregate time of 4 sms send is 14 sec. Send time of 1 separate sms is 4-6 sec. How to reach aggregate time 4-6 sec spent for sending 4 sms?

my smsd.conf:
devices = GSM* 1-8 outgoing = /var/spool/sms/outgoing checked = /var/spool/sms/checked incoming = /var/spool/sms/incoming logfile = /var/log/smsd.log infofile = /var/run/smstools/smsd.working pidfile = /var/run/smstools/smsd.pid outgoing = /var/spool/sms/outgoing checked = /var/spool/sms/checked failed = /var/spool/sms/failed incoming = /var/spool/sms/incoming sent = /var/spool/sms/sent stats = /var/log/smstools/smsd_stats loglevel = 7 receive_before_send = no autosplit = 3 report=/var/spool/sms/reports eventhandler=/var/www/html/statuser.php [queues] main = /var/spool/sms/queue [GSM1] queues=main init=ATE0 device = /dev/modem0 smsc = 79042140000 baudrate = 9600 primary_memory = SM secondary_memory = SR report=yes incoming=yes [sections GSM2..8] are equal, only "device =" is changed to appropriate.

my top status:
ps ax | grep sms 18809 ? Ss 0:00 /usr/local/bin/smsd -n MAINPROCESS -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18811 ? S 0:00 /usr/local/bin/smsd -n GSM1_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18812 ? R 0:00 /usr/local/bin/smsd -n GSM2_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18813 ? S 0:00 /usr/local/bin/smsd -n GSM3_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18814 ? S 0:00 /usr/local/bin/smsd -n GSM4_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18815 ? S 0:00 /usr/local/bin/smsd -n GSM5_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18816 ? S 0:00 /usr/local/bin/smsd -n GSM6_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18817 ? R 0:00 /usr/local/bin/smsd -n GSM7_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log 18818 ? S 0:00 /usr/local/bin/smsd -n GSM8_______ -p/var/run/smsd.pid -i/var/run/smsd.working -l/var/log/smsd.log

my 4 sms sending log:
tail -f /var/log/smsd.log | grep "queue\|SMS sent" 2016-04-11 16:26:36,6, GSM4: I have to send 1 short message for /var/spool/sms/queue/BzUdswa5xL9eKrMRMK0e 2016-04-11 16:26:42,6, GSM8: I have to send 1 short message for /var/spool/sms/queue/deC7M97SsgcvRkqfbmR5 2016-04-11 16:26:42,5, GSM4: SMS sent, Message_id: 133, To: 790421445XX, sending time 6 sec. 2016-04-11 16:26:43,6, GSM4: Moved file /var/spool/sms/queue/BzUdswa5xL9eKrMRMK0e to /var/spool/sms/sent/BzUdswa5xL9eKrMRMK0e 2016-04-11 16:26:43,6, GSM4: I have to send 1 short message for /var/spool/sms/queue/k3B7VnRVCUixGUAT47Lc 2016-04-11 16:26:43,6, GSM7: I have to send 1 short message for /var/spool/sms/queue/mUMC2caxS78r1mUyx05i 2016-04-11 16:26:45,5, GSM4: SMS sent, Message_id: 134, To: 790365415XX, sending time 2 sec. 2016-04-11 16:26:45,6, GSM4: Moved file /var/spool/sms/queue/k3B7VnRVCUixGUAT47Lc to /var/spool/sms/sent/k3B7VnRVCUixGUAT47Lc 2016-04-11 16:26:48,5, GSM8: SMS sent, Message_id: 102, To: 795186390XX, sending time 6 sec. 2016-04-11 16:26:48,6, GSM8: Moved file /var/spool/sms/queue/deC7M97SsgcvRkqfbmR5 to /var/spool/sms/sent/deC7M97SsgcvRkqfbmR5 2016-04-11 16:26:50,5, GSM7: SMS sent, Message_id: 112, To: 792045377XX, sending time 7 sec. 2016-04-11 16:26:50,6, GSM7: Moved file /var/spool/sms/queue/mUMC2caxS78r1mUyx05i to /var/spool/sms/sent/mUMC2caxS78r1mUyx05i