memory usage at a given time

Hello,

My computer has 2 x 4GB memory, as one can see in dmesg. A part of it is
used by the video card, I'm not sure how much, maybe around 256MB or less I
want to know if I will hit the swap space when I will let it run on 1 x 4GB
memory, but I'm not sure how to interpret some of the following outputs or
if I need to run other commands:

$ dmesg
OpenBSD 6.8-current (GENERIC.MP) #175: Wed Nov 11 10:02:40 MST 2020
deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8029429760 (7657MB)
avail mem = 7770787840 (7410MB)
[ ... ]
spdmem0 at iic0 addr 0x52: 4GB DDR3 SDRAM PC3-10600
spdmem1 at iic0 addr 0x53: 4GB DDR3 SDRAM PC3-10600
[ ... ]

$ systat
1 users Load 0.19 0.37 0.31 thinkc.my.domain
02:23:22

memory totals (in KB) PAGING SWAPPING
Interrupts
real virtual free in out in out 360
total
Active 1530836 1530836 2928304 ops 100
clock
All 4668644 4668644 11031684 pages 237 ipi

radeondr
Proc:r d s w Csw Trp Sys Int Sof Flt forks 13
ahci0
2 259 769 746 3040 22 288 520 fkppw
ohci0
fksvm
ehci0
0.0%Int 0.1%Spn 1.1%Sys 5.1%Usr 93.7%Idle pwait 8
ohci1
| | | | | | | | | | | 175 relck
ehci1
=>> 175 rlkok
azalia0
noram
ohci2
Namei Sys-cache Proc-cache No-cache 56 ndcpy 2 bge0
Calls hits % hits % miss % fltcp
ohci3
102 79 77 22 22 295 zfod
pckbc0
cow
Disks sd0 cd0 63307 fmin
seeks 84409 ftarg
xfers 26 itarg
speed 410K 2 wired 3
IPKTS
sec 0.0 pdfre 1
OPKTS

$ vmstat
procs memory page disks traps cpu
r s avm fre flt re pi po fr sr sd0 cd0 int sys cs us sy
id
1 259 1504M 2848M 1450 0 0 0 0 0 2 0 174 13338 3982 13 3
83