it's not related to guest os, it's related to how much the guest system's behavior pokes the bear inside 10.15.6.
windows pokes it hard just by breathing.
i have a xubuntu guest, very low impact in general, but i can make the bear dance like a puppet by increasing & decreasing network file i/o. leak faster! now slower! now faster!
this is why i have istat menus on my host menu bar now, showing only memory pressure % in bold, purple text. the guest os is gonna do what it wants. the only reliable way i've found to tell how my 10.15.6 host is reacting is by watching how hard it's having to work managing memory. for me, a crash is near certain once memory pressure reaches 65% so i try to restart before it reaches 60%, and i have istat alerts set to warn me as mem pressure climbs past 50%. last crash i had was five days ago. restarting host twice a day.
ps. istat also has history, which has been super helpful figuring out what to do. the last crash i experienced was thursday evening.
memory pressure basically shows the wired memory growth. the downtime on saturday was weekly maintenance.
friday 2p is more important though. the first peak was when i got a warning & i quit some background apps & logged out a user who was done for the day. the second peak warning was when i shut down the vm & finished what else i was doing before restarting.
the peak on monday was when i was deciding whether or not to let the apple tech persuade me to induce the crash. it was looming.
