10. Reference

Quick-lookup tables. Everything here is a real limit or format enforced by the platform, not a recommendation.

10.1 File size limits

What you are uploading	Limit
Student programming submission (per file)	20 KB
Instructor “additional file” on a programming activity	20 KB
Student file upload in a lab quiz	10 MB
Email recipients CSV / XLSX import	5 MB
Gradebook CSV import	5 MB
Video upload	Chunked automatically above 1 MB; overall cap is set by the course owner’s plan
Course import archive	Chunked automatically in 2 MB pieces

The 20 KB submission limit is the one students hit. Files over it are silently skipped in a bulk ZIP upload and reported afterwards — warn students who submit large data files alongside their code.

10.2 Code execution limits

Defaults applied to student submissions:

	C / C++	Python	Java
CPU time	10 s	20 s	15 s
Wall-clock time	10 s	20 s	15 s
Memory	32 MB	48 MB	48 MB
Stack	8 MB	8 MB	8 MB
Child processes	0	0	0
Open files	15	15	15
Output file size	3 MB	3 MB	3 MB

Child processes are 0 — a submission that forks or spawns a thread pool will fail regardless of your time limit.

What you may change

Setting	Minimum	Maximum
CPU time / clock time	1 s	240 s
Memory	15 MB	256 MB
Stack	8 MB	64 MB

Language groups are C (C, C++, Simplecpp), Python (Python3), and Java — you set limits per group, not per language.

Output shown to students

Results are truncated at 200 lines or 50,000 characters, whichever comes first, and marked as truncated. A program producing more output than this will appear to the student as a failure rather than as an output problem.

10.3 Attempt limits

Setting	Default
Maximum submission attempts	100
Maximum “run without submit” attempts	100

Students see their remaining counts in a banner, which turns red at 3 or fewer. Exhausting submissions produces a “Maximum Submissions Reached” modal — they cannot submit again, and only you can raise the limit.

10.4 CSV formats

Gradebook extra-columns import

First column must be email. Headers define the column:

Header	Creates
`Midterm[100]`	Number column out of 100
`Viva[12.5]`	Decimals are permitted
`Comments[text]`	Text column (max 255 characters)
`Attendance`	Must match an existing column name exactly

Values --, -, N/A, n/a, NA, na, or blank are skipped, not zeroed.

Full details: §7.7

Gradebook export

email, Name, Roll No,
MB: <item> …, MB Total,
Lab: <item> …, Lab Total,
<ExtraColumn>[100] …, Extra Total

Round-trippable — export, edit, re-import.

Email recipients import

.csv or .xlsx accepted
Must contain a column headed email — anywhere in the header row, not necessarily first
CSV must be UTF-8: “CSV file must be UTF-8 encoded.”
Course owner only — not STA, not JTA

Results are grouped into matched, not enrolled, invalid emails (with row numbers), and duplicates removed. The final step adds matched people as recipients; it does not send anything.

Proctor log export

Student_email, Student_Name, Roll_No, Exam_name, ipaddress, newipadd,
is_approved, start_time, duration, given_duration, flag_reason,
flagged_at, flag_details

10.5 Quiz question file (SAFE ODT format)

Blocks are separated by a line of = characters.

QUESTION= singlecorrect, MARKS=2, NEG= -1, CATEGORY=easy
What is the capital of France?
OPTIONS=
    A. London
    B. Paris
ANSWER=B
ANSDESC =
Paris is the capital of France

================================================================================

Keyword	Question type
`singlecorrect`	Single correct answer (radio)
`setcorrect`	Multiple correct — `ANSWER=A, C`
`numeric`	Numeric — `ANSWER=42` or a range `ANSWER=[0.88,0.89]`
`fillblanks`	Fill in the blanks — `BLANKS=n` in the header, then one `BLANK=text, MARKS=1.5, ANSWER='...'` line per blank
`paper`	Descriptive, graded manually — no `ANSWER`
`module`	Groups questions — `QUESTION= module, COUNT=2, CATEGORY=General`, where `COUNT` is how many following questions belong to it

⚠️ Questions inside a module can only be edited or deleted from the Module Editor, not from the flat question list.

10.6 Roles at a glance

Capability	INSTRUCTOR	STA	JTA
Create / edit / delete activities and testcases	✅	✅	❌
See hidden activities, solutions, execution settings	✅	✅	❌
Start / end / proctor an exam	✅	✅	❌
Submit on a student’s behalf	✅	✅	❌
Change code execution resource limits	✅	✅	view only
Edit manual marks	✅	✅	✅
Comment on submissions	✅	✅	own only
Export lab / activity	✅	✅	✅
See hidden testcases	✅	✅	✅
Access the gradebook	✅	✅	❌
Import email recipients	owner only	❌	❌
Delete content (with content protection on)	creator only	❌	❌

INSTRUCTOR and STA are otherwise identical. The only distinctions are course ownership and creation, not the role name.

10.7 Time and scheduling

Setting	Default
Exam duration	30 min (minimum, browser-enforced)
Exam start buffer	5 min (minimum, browser-enforced)
Submission grace period after a lab closes	60 seconds
Quiz question attempts	1
Imported labs — available from	Now
Imported labs — available till	Now + 365 days

Platform time zone is Asia/Kolkata. All times you enter and see are in that zone.

10.8 Account and session limits

Limit	Value
Concurrent sessions per user	2 — a third login ends all others
Session validity	1 week, auto-refreshed while in use
Password	≥ 8 characters, ≥ 1 capital, ≥ 1 special character
Students per course	Set by the course owner’s plan
Courses per owner	Set by the plan

10.9 Features that are not available

Documented so you stop looking for them.

Not available	Note
Single sign-on / Google login	Backend exists but is disabled; no button is rendered
Site-wide search	The search subsystem is not enabled
Category weighting in the gradebook	Flat unweighted average only
Excel export of grades	CSV only
Quiz Statistics	Shows a “Coming soon” placeholder
Bulk Upload Testcases / Import Testcases / Configure Resource Limit modals	Menu items exist; the modals were never built
Testcase re-ordering	Tooltip reads “Re-order: not implemented”
Recycle Bin for Virtual and Other activities	Only Programming activities can be restored — the rest are deleted permanently
Export of Virtual and Other activities	Lab export covers Programming only
Exam enforcement for Virtual (CLab) activities	Designed, never built
Student Grades V2 view	Feature flag is off in every environment
Lab Performance (student view)	Shows “coming soon”
Certificates and brochures	Show “Coming Soon”
A “Labs” checkbox in the course import dialog	Labs import with a whole-archive import; there is no separate selector
Automatic course list refresh after import	Refresh the page manually

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